Amid mounting unrest in the Middle East, President Obama today warned Iran that the time for diplomacy is running out and challenged global leaders to confront the "deeper causes" of the crises, saying the turmoil serves as a reminder that true democracy is "hard work."

"We face a choice between the forces that would drive us apart, and the hopes we hold in common," the president told the United Nations General Assembly.

"The attacks of the last two weeks are not simply an assault on America," he argued. "They are also an assault on the very ideals upon which the United Nations was founded – the notion that people can resolve their differences peacefully; that diplomacy can take the place of war; and that in an interdependent world, all of us have a stake in working towards greater opportunity and security for our citizens."

Two years after the start of the Arab Spring and six weeks before U.S. elections, the president insisted "progress" has been made, but made clear "democracy does not end with the casting of a ballot."

"True democracy – real freedom – is hard work," he said.

Transcript: President Obama's remarks at the U.N.

"True democracy demands that citizens cannot be thrown in jail because of what they believe, and businesses can be opened without paying a bribe. It depends on the freedom of citizens to speak their minds and assemble without fear; on the rule of law and due process that guarantees the rights of all people," he said.

As tensions rise over Iran's nuclear ambitions and the United States leads a mine-clearing exercise in the Persian Gulf, Obama also warned Tehran that the United States will "do what we must" to prevent it from obtaining a nuclear weapon.

The president argued there is still "time and space" for diplomacy, but said "time is not unlimited."

"We respect the right of nations to access peaceful nuclear power, but one of the purposes of the United Nations is to see that we harness that power for peace. Make no mistake: a nuclear-armed Iran is not a challenge that can be contained," he said.

IRAN 1946 Nuclear threat Soviet troops told to leave north.
YUGOSLAVIA 1946 Nuclear threat, naval Response to shoot-down of US plane.
URUGUAY 1947 Nuclear threat Bombers deployed as show of strength.
GREECE 1947-49 Command operation U.S. directs extreme-right in civil war.
GERMANY 1948 Nuclear Threat Atomic-capable bombers guard Berlin Airlift.
CHINA 1948-49 Troops/Marines evacuate Americans before Communist victory.
PHILIPPINES 1948-54 Command operation CIA directs war against Huk Rebellion.
PUERTO RICO 1950 Command operation Independence rebellion crushed in Ponce.
KOREA 1951-53 (-?) Troops, naval, bombing , nuclear threats U.S./So. Korea fights China/No. Korea to stalemate; A-bomb threat in 1950, and against China in 1953. Still have bases.
IRAN 1953 Command Operation CIA overthrows democracy, installs Shah.
VIETNAM 1954 Nuclear threat French offered bombs to use against seige.
GUATEMALA 1954 Command operation, bombing, nuclear threat CIA directs exile invasion after new gov't nationalized U.S. company lands; bombers based in Nicaragua.
EGYPT 1956 Nuclear threat, troops Soviets told to keep out of Suez crisis; Marines evacuate foreigners.
LEBANON l958 Troops, naval Army & Marine occupation against rebels.
IRAQ 1958 Nuclear threat Iraq warned against invading Kuwait.
CHINA l958 Nuclear threat China told not to move on Taiwan isles.
PANAMA 1958 Troops Flag protests erupt into confrontation.
VIETNAM l960-75 Troops, naval, bombing, nuclear threats Fought South Vietnam revolt & North Vietnam; one million killed in longest U.S. war; atomic bomb threats in l968 and l969.
CUBA l961 Command operation CIA-directed exile invasion fails.
GERMANY l961 Nuclear threat Alert during Berlin Wall crisis.
LAOS 1962 Command operation Military buildup during guerrilla war.
CUBA l962 Nuclear threat, naval Blockade during missile crisis; near-war with Soviet Union.
IRAQ 1963 Command operation CIA organizes coup that killed president, brings Ba'ath Party to power, and Saddam Hussein back from exile to be head of the secret service.
PANAMA l964 Troops Panamanians shot for urging canal's return.
INDONESIA l965 Command operation Million killed in CIA-assisted army coup.
DOMINICAN REPUBLIC 1965-66 Troops, bombing Army & Marines land during election campaign.
GUATEMALA l966-67 Command operation Green Berets intervene against rebels.
DETROIT l967 Troops Army battles African Americans, 43 killed.
UNITED STATES l968 Troops After King is shot; over 21,000 soldiers in cities.
CAMBODIA l969-75 Bombing, troops, naval Up to 2 million killed in decade of bombing, starvation, and political chaos.
OMAN l970 Command operation U.S. directs Iranian marine invasion.
LAOS l971-73 Command operation, bombing U.S. directs South Vietnamese invasion; "carpet-bombs" countryside.
SOUTH DAKOTA l973 Command operation Army directs Wounded Knee siege of Lakotas.
MIDEAST 1973 Nuclear threat World-wide alert during Mideast War.
CHILE 1973 Command operation CIA-backed coup ousts elected marxist president.
CAMBODIA l975 Troops, bombing Gassing of captured ship Mayagüez, 28 troops die when copter shot down.
ANGOLA l976-92 Command operation CIA assists South African-backed rebels.
IRAN l980 Troops, nuclear threat, aborted bombing Raid to rescue Embassy hostages; 8 troops die in copter-plane crash. Soviets warned not to get involved in revolution.
LIBYA l981 Naval jets Two Libyan jets shot down in maneuvers.
EL SALVADOR l981-92 Command operation, troops Advisors, overflights aid anti-rebel war, soldiers briefly involved in hostage clash.
NICARAGUA l981-90 Command operation, naval CIA directs exile (Contra) invasions, plants harbor mines against revolution.
LEBANON l982-84 Naval, bombing, troops Marines expel PLO and back Phalangists, Navy bombs and shells Muslim positions. 241 Marines killed when Shi'a rebel bombs barracks.
GRENADA l983-84 Troops, bombing Invasion four years after revolution.
HONDURAS l983-89 Troops Maneuvers help build bases near borders.
IRAN l984 Jets Two Iranian jets shot down over Persian Gulf.
LIBYA l986 Bombing, naval Air strikes to topple Qaddafi gov't.
BOLIVIA 1986 Troops Army assists raids on cocaine region.
IRAN l987-88 Naval, bombing US intervenes on side of Iraq in war, defending reflagged tankers and shooting down civilian jet.
LIBYA 1989 Naval jets Two Libyan jets shot down.
VIRGIN ISLANDS 1989 Troops St. Croix Black unrest after storm.
PHILIPPINES 1989 Jets Air cover provided for government against coup.
PANAMA 1989 (-?) Troops, bombing Nationalist government ousted by 27,000 soldiers, leaders arrested, 2000+ killed.
LIBERIA 1990 Troops Foreigners evacuated during civil war.
SAUDI ARABIA 1990-91 Troops, jets Iraq countered after invading Kuwait. 540,000 troops also stationed in Oman, Qatar, Bahrain, UAE, Israel.
IRAQ 1990-91 Bombing, troops, naval Blockade of Iraqi and Jordanian ports, air strikes; 200,000+ killed in invasion of Iraq and Kuwait; large-scale destruction of Iraqi military.
KUWAIT 1991 Naval, bombing, troops Kuwait royal family returned to throne.
IRAQ 1991-2003 Bombing, naval No-fly zone over Kurdish north, Shiite south; constant air strikes and naval-enforced economic sanctions
LOS ANGELES 1992 Troops Army, Marines deployed against anti-police uprising.
SOMALIA 1992-94 Troops, naval, bombing U.S.-led United Nations occupation during civil war; raids against one Mogadishu faction.
YUGOSLAVIA 1992-94 Naval NATO blockade of Serbia and Montenegro.
BOSNIA 1993-? Jets, bombing No-fly zone patrolled in civil war; downed jets, bombed Serbs.
HAITI 1994 Troops, naval Blockade against military government; troops restore President Aristide to office three years after coup.
ZAIRE (CONGO) 1996-97 Troops Troops at Rwandan Hutu refugee camps, in area where Congo revolution begins.
LIBERIA 1997 Troops Soldiers under fire during evacuation of foreigners.
ALBANIA 1997 Troops Soldiers under fire during evacuation of foreigners.
SUDAN 1998 Missiles Attack on pharmaceutical plant alleged to be "terrorist" nerve gas plant.
AFGHANISTAN 1998 Missiles Attack on former CIA training camps used by Islamic fundamentalist groups alleged to have attacked embassies.
IRAQ 1998 Bombing, Missiles Four days of intensive air strikes after weapons inspectors allege Iraqi obstructions.
YUGOSLAVIA 1999 Bombing, Missiles Heavy NATO air strikes after Serbia declines to withdraw from Kosovo. NATO occupation of Kosovo.
YEMEN 2000 Naval USS Cole, docked in Aden, bombed.
MACEDONIA 2001 Troops NATO forces deployed to move and disarm Albanian rebels.
UNITED STATES 2001 Jets, naval Reaction to hijacker attacks on New York, DC
AFGHANISTAN 2001-? Troops, bombing, missiles Massive U.S. mobilization to overthrow Taliban, hunt Al Qaeda fighters, install Karzai regime, and battle Taliban insurgency. More than 30,000 U.S. troops and numerous private security contractors carry our occupation.
YEMEN 2002 Missiles Predator drone missile attack on Al Qaeda, including a US citizen.
PHILIPPINES 2002-? Troops, naval Training mission for Philippine military fighting Abu Sayyaf rebels evolves into combat missions in Sulu Archipelago, west of Mindanao.
COLOMBIA 2003-? Troops US special forces sent to rebel zone to back up Colombian military protecting oil pipeline.
IRAQ 2003-? Troops, naval, bombing, missiles Saddam regime toppled in Baghdad. More than 250,000 U.S. personnel participate in invasion. US and UK forces occupy country and battle Sunni and Shi'ite insurgencies. More than 160,000 troops and numerous private contractors carry out occupation and build large permanent bases.
LIBERIA 2003 Troops Brief involvement in peacekeeping force as rebels drove out leader.
HAITI 2004-05 Troops, naval Marines & Army land after right-wing rebels oust elected President Aristide, who was advised to leave by Washington.
PAKISTAN 2005-? Missiles, bombing, covert operation CIA missile and air strikes and Special Forces raids on alleged Al Qaeda and Taliban refuge villages kill multiple civilians. Drone attacks also on Pakistani Mehsud network.
SOMALIA 2006-? Missiles, naval, troops, command operation Special Forces advise Ethiopian invasion that topples Islamist government; AC-130 strikes, Cruise missile attacks and helicopter raids against Islamist rebels; naval blockade against "pirates" and insurgents.
SYRIA 2008 Troops Special Forces in helicopter raid 5 miles from Iraq kill 8 Syrian civilians
YEMEN 2009-? Missiles, command operation Cruise missile attack on Al Qaeda kills 49 civilians; Yemeni military assaults on rebels
LIBYA 2011-? Bombing, missiles, command operation NATO coordinates air strikes and missile attacks against Qaddafi government during uprising by rebel army.

INSERT NATION HERE IF AND WHEN IT ACTUALLY HAPPENS

In July 2012, the United States State Department released a report on terrorism around the world in 2011. The report states that "Iran remained an active state sponsor of terrorism in 2011 and increased its terrorist-related activity" and that "Iran also continued to provide financial, material, and logistical support for terrorist and militant groups throughout the Middle East and Central Asia." The report states that Iran has continued to provide "lethal support, including weapons, training, funding, and guidance, to Iraqi Shia militant groups targeting U.S. and Iraqi forces, as well as civilians," despite pleding to support the stabilization of Iraq, and that the Qods Force provided training to the Taliban in Afghanistan on "small unit tactics, small arms, explosives, and indirect fire weapons, such as mortars, artillery, and rockets." The report further states that Iran has provided weapons and training to the Assad regime in Syria which has launched a brutal crackdown on Syrian rebels, as well as providing weapons, training, and funding to Hamas, Palestinian Islamic Jihad, and the Popular Front for the Liberation of Palestine-General Command, among others, and has assisted in rearming Hizballah. The report states as well that Iran has remained unwilling to bring to justice senior members of Al Qaeda that it continued to detain, and also refused to publicly identify these senior members, as well as that Iran has allowed Al Qaeda members to operate a core facilitation pipeline through Iranian territory, which has enabled Al Qaeda to carry funds and move facilitators and operatives to South Asia and elsewhere.[9][10][11]