DUBAI, United Arab Emirates (AP) — Iran held annual military drills with Russia on Thursday as a second American aircraft carrier drew closer to the Middle East, with both the United States and Iran signaling they are prepared for war if talks on Tehran's nuclear program fizzle out.

President Donald Trump has said he hopes to reach a deal with Iran, but the talks have been deadlocked for years, and Iran has refused to discuss wider U.S. and Israeli demands that it scale back its missile program and sever ties to armed groups. Indirect talks held in recent weeks made little visible progress, and one or both sides could be buying time for final war preparations.

Iran’s theocracy is more vulnerable than ever, following 12 days of Israeli and U.S. strikes on its nuclear sites and military last year, as well as mass protests in January that were violently suppressed. But it is still capable of striking Israel and U.S. bases in the region, and has warned that any attack would trigger a regional war.

Iran earlier this week launched a drill that involved live-fire in the Strait of Hormuz, the narrow opening of the Persian Gulf through which a fifth of the world's traded oil passes.

Tensions are also rising inside Iran, as mourners hold ceremonies honoring slain protesters 40 days after their killing by security forces. Some gatherings have seen anti-government chants despite threats from authorities.

Trump again threatens Iran

The movements of additional American warships and airplanes, with the USS Gerald R. Ford aircraft carrier near the mouth of the Mediterranean Sea, don't guarantee a U.S. strike on Iran — but it bolsters Trump's ability to carry out one should he choose to do so.

He has so far held off on striking Iran after setting red lines over the killing of peaceful protesters and mass executions, while reengaging in nuclear talks that were disrupted by the war in June.

Iran has agreed to draw up a written proposal to address U.S. concerns raised during this week’s indirect nuclear talks in Geneva, according to a senior U.S. official who was not authorized to comment publicly and spoke on the condition of anonymity.

The official said top national security officials gathered Wednesday to discuss Iran, and were briefed that the “full forces” needed to carry out potential military action are expected to be in place by mid-March. The official did not provide a timeline for when Iran is expected to deliver its written response.

“It’s proven to be, over the years, not easy to make a meaningful deal with Iran, and we have to make a meaningful deal. Otherwise bad things happen,” Trump said Thursday.

Growing international concern

Polish Prime Minister Donald Tusk urged his nation's citizens to immediately leave Iran as “within a few, a dozen, or even a few dozen hours, the possibility of evacuation will be out of the question.” He did not elaborate, and the Polish Embassy in Tehran did not appear to be drawing down its staff.

The German military said that it had moved “a mid-two digit number of non-mission critical personnel” out of a base in northern Iraq because of the current situation in the region and in line with its partners’ actions. It said that some troops remain to help keep the multinational camp running in Irbil, where they train Iraqi forces.

“This week, another 50 U.S. combat aircraft — F-35s, F-22s, and F-16s — were ordered to the region, supplementing the hundreds deployed to bases in the Arab Gulf states,” the New York-based Soufan Center think tank wrote. “The deployments reinforce Trump’s threat — restated on a nearly daily basis — to proceed with a major air and missile campaign on the regime if talks fail.”

Iran holds drill with Russia

Iranian forces and Russian sailors conducted the annual drills in the Gulf of Oman and the Indian Ocean aimed at “upgrading operational coordination as well as exchange of military experiences,” Iran's state-run IRNA news agency reported.

Footage later released by Iran showed members of the paramilitary Revolutionary Guard's naval special forces board a vessel in the exercise. Those forces are believed to have been used in the past to seize vessels in key international waterways.

Iran also issued a rocket-fire warning to pilots in the region, suggesting it planned to launch anti-ship missiles in the exercise.

Meanwhile, tracking data showed the Ford off the coast of Morocco in the Atlantic Ocean midday Wednesday, meaning the carrier could transit through Gibraltar and potentially station in the eastern Mediterranean with its supporting guided-missile destroyers.

It would likely take more than a week for the Ford to be off the coast of Iran.

Netanyahu warns Iran

Israel is making its own preparations for possible Iranian missile strikes in response to any U.S. action.

“We are prepared for any scenario,” Israeli Prime Minister Benjamin Netanyahu said Thursday, adding that if Iran attacks Israel, “they will experience a response they cannot even imagine.”

Netanyahu, who met with Trump last week, long has pushed for tougher U.S. action against Iran and says any deal should not only end its nuclear program but curb its missile arsenal and force it to cut ties with militant groups like Hamas and Hezbollah.

Iran has said the current talks should only focus on its nuclear program, and that it hasn't been enriching uranium since the U.S. and Israeli strikes last summer. Trump said at the time that the strikes had “obliterated” Iran's nuclear sites, but the exact damage is unknown as Tehran has barred international inspectors.

Iran has always insisted its nuclear program is peaceful, while the U.S. and others suspect it is aimed at eventually developing weapons. Israel is widely believed to have nuclear weapons but has neither confirmed nor denied that.

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Associated Press writers Nasser Karimi in Tehran, Iran; Claudia Ciobanu in Warsaw, Poland; Geir Moulson in Berlin; and Aamer Madhani in Washington contributed to this report.

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