Russian President Vladimir Putin said Thursday he supports a U.S.-proposed 30-day ceasefire with Ukraine but insists key details must be worked out.

Earlier this week, Ukraine agreed to the 30-day truce following negotiations with the U.S. in Saudi Arabia. The ceasefire proposal applies to the entire front line of the ongoing conflict between Russia and Ukraine and includes a halt to air and sea attacks, as well as the release of prisoners.

“The idea itself is correct, and we support it,” Putin said at a press conference in Moscow. “But we need to discuss it with our American colleagues and perhaps have a call with President [Donald] Trump.”

Putin said that the U.S. had likely convinced Ukraine to agree to a ceasefire and noted that Kyiv’s interest in the proposal stems from the battlefield situation, particularly in Kursk. Recent reports stated that Russia has recaptured Sudzha, a strategic town in Kursk and one of the last Ukrainian-held areas on Russian soil.

Questioning the fate of Ukrainian troops in Kursk, Putin asked: “Will all those who are there come out without a fight? Or will the Ukrainian leadership order them to lay down their arms and surrender?”

Putin also proposed that Ukraine suspend troop mobilization and training, while urging other nations to halt weapons shipments to Kyiv during the ceasefire. 

Putin’s statement comes after Kremlin aide Yuriy Ushakov said that Moscow opposes a temporary ceasefire, arguing it would only provide a reprieve for the Ukrainian military. He said he conveyed Russia’s position to U.S. National Security Adviser Michael Waltz during a phone call on Wednesday.

Meanwhile, in his nightly address, Ukrainian President Volodymyr Zelenskyy accused Putin of “preparing to reject the ceasefire.”

“Putin, of course, is afraid to tell President Trump directly that he wants to continue this war, that he wants to kill Ukrainians,” he added.

Trump, who said he was willing to talk to Putin by phone, called the Russian leader’s statement “very promising” and expressed hope that Moscow would “do the right thing.”

He said his special envoy, Steve Witkoff, was in Moscow engaging in talks with Russian officials on the proposed ceasefire. Trump added that Thursday’s discussions would reveal whether Moscow was ready to make a deal. “We’re going to see if Russia is serious. If not, it will be disappointing,” he said.

On Tuesday, the United States agreed to resume weapons deliveries and intelligence sharing with Ukraine after Kyiv expressed support for the ceasefire proposal.