State Department tells Americans worldwide to 'exercise increased caution'

An Airforce F-35 plane that conducted an emergency landing just before midnight Wednesday is believed to have been struck by Iranian fire, according to a source familiar with the incident.

The stealth plane landed after flying a combat mission over Iran, according to Capt. Tim Hawkins, a CENTCOM spokesperson.

This is the first time that an American military aircraft involved in the air operations over Iran has been hit by Iranian fire.

-ABC News' Luis Martinez

Asked about the Department of Defense’s $200 billion request to the White House on Wednesday, President Donald Trump said the money is intended for military feats beyond the war in Iran and argued that the administration is being “very judicious" with the request.

Trump called it a “small price to pay to make sure we stay tippy top.”

The Congressional Research Service calculated the U.S. spent $815 billion in direct costs for the war in Iraq through 2014, after more than a decade of military operations there. This war has lasted less than three weeks.

Earlier this month, Pentagon officials told a group of senators in a closed door briefing that the war in Iran cost at least $11.3 billion dollars in its first six days.

-ABC News' Selina Wang, Anne Flaherty and Isabella Murray

The U.S. State Department has green lit and fast-tracked more than $16 billion dollars’ worth of arms sales to the UAE, Jordan and Kuwait, according to the government.

The UAE has been cleared to purchase 10 Site- Low, Slow, Small Unmanned Aircraft Integrated Defeat Systems, which are used to detect, track and neutralize hostile drones; long-range discrimination radar integrated with Terminal High Altitude Area Defense for missile defense; F-16 munitions and upgrades; and 400 Advanced Medium-Range Air-to-Air Missiles. The estimated cost for these sales is just under $8.5 billion, according to the department.

Kuwait is seeking to buy Lower Tier Air and Missile Defense Sensor Radars for an estimated cost of $8 billion, while Jordan is looking to make a smaller purchase of aircraft and munitions support and related equipment for an estimated cost of $70.5 million, according to the department.

All sales are being fast-tracked due to an emergency declaration made by Secretary of State Marco Rubio, waiving congressional review requirements, according to the department.

The UAE is a designated “major defense partner” of the U.S., and at the beginning of this year, it was the 11th largest U.S. defense customer by value. Kuwait, a major non-NATO ally, has also purchased numerous large arms packages from the U.S. in recent years, according to the department.

Qatar's Prime Minister and Minister of Foreign Affairs Sheikh Mohammed Bin Abdulrahman Al Thani called for an immediate end to the war during a press conference with Turkish Foreign Minister Hakan Fidan.

"Everyone knows who benefits from this war and from dragging the region into this conflict. Unfortunately, what is happening now is in service of these agendas," he said.

Qatar reserves the "right to respond to this attack through all available legal means and for these attacks there will be a cost according to international law," he said.

Qatar ordered Iranian embassy officials to leave the country on Wednesday over the repeated targeting of its territory after Iran struck the world's largest liquified natural gas terminal in Qatar.