KYIV – Ukraine and Russia targeted each other with long-range strikes, officials said Monday, amid continuing uncertainty about whether an agreement to stop their more than three-year war is within reach at the start of what America’s top diplomat called a “very critical” week.

The Russian Defense Ministry said its forces downed 119 Ukrainian drones overnight, most of them over Russia’s Bryansk border region. In Ukraine, air raid sirens rang out across the country Monday morning. There were no immediate reports of casualties or damage.

The outcome of a push by U.S. President Donald Trump’s administration to swiftly end the fighting remains unclear, clouded by conflicting claims and doubts about how far each side might be willing to compromise amid deep hostility and mistrust.

The clock is ticking on Washington’s engagement in efforts to resolve Europe’s biggest conflict since World War II that has cost tens of thousands of lives.

U.S. Secretary of State Marco Rubio said Sunday that this week would be “very critical.” The U.S. needs to “make a determination about whether this is an endeavor that we want to continue to be involved in,” he said on NBC’s “Meet the Press.”

American military aid has been crucial for Ukraine’s war effort, and further help could be at risk if the Trump administration walks away from attempts to end the war.

Trump said at the weekend he harbors doubts about Russian President Vladimir Putin’s sincerity in pursuing a deal, as Russian forces have continued to strike civilian areas of Ukraine with cruise and ballistic missiles while the talks have proceeded.

But on Friday, Trump described a brokered settlement on the war as “close.”

Western European officials have accused the Kremlin of dragging its feet on peace talks so that Russian forces, which are bigger than Ukraine’s and have battlefield momentum, can capture more Ukrainian land.

Russian Foreign Minister Sergey Lavrov discussed the war in a phone call with U.S. Secretary of State Marco Rubio on Sunday, the Russian Foreign Ministry said.

The two diplomats focused on “consolidating the emerging prerequisites for starting negotiations,” the statement said, without offering further details.

Russia has effectively rejected a U.S. proposal for an immediate and full 30-day halt in the fighting by imposing far-reaching conditions. Ukraine has accepted it, Ukrainian President Volodymyr Zelenskyy says.

A French diplomatic official said at the weekend that Trump, Zelenskyy and French President Emmanuel Macron agreed “to pursue in the coming days the work of convergence” to obtain “a solid ceasefire.”

The diplomat said a truce is a “prior condition for a peace negotiation that respects the interest of Ukraine and the Europeans.”

The official was not authorized to be publicly named in accordance with French presidential policy.

Ukraine, meanwhile, has balked at the possibility of surrendering land to Russia in return for peace, which Washington has indicated could be necessary.

A key point of leverage for Ukraine could be a deal with Washington that grants access to Ukraine’s critical mineral wealth.

Ukraine and the United States have made progress on a mineral agreement, with both sides agreeing that American aid provided so far to Kyiv will not be taken into account under the terms of the deal, Ukrainian Prime Minister Denys Shmyhal said Sunday.

“We have good progress,” he said after talks with U.S. Treasury Under Secretary Scott Bessent in Washington.

“The main thing is that we clearly defined our red lines: The agreement must comply with Ukraine’s Constitution, legislation, and European commitments, and must be ratified by Parliament,” Shmyhal said.

The war that broke out after Russia’s full-scale invasion of its neighbor in February 2022 has developed a significant international dimension, further complicating negotiations.

Putin on Monday thanked North Korea for sending what the U.S. estimates are thousands of troops to help defeat Ukraine, as well as allegedly supplying artillery ammunition.

Iran has also helped Russia in the war, with Shahed drones, and China has sold Russia machinery and microelectronics that Moscow can use to make weapons, Western officials say.

The U.S. and Europe have been Kyiv’s biggest backers.

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