Donald Trump on Sunday pushed Russian leader Vladimir Putin to act to reach an immediate ceasefire with Ukraine, describing it as part of his active efforts as president-elect to end the war despite being weeks from taking office.

“Zelenskyy and Ukraine would like to make a deal and stop the madness,” Trump wrote on social media, referring to Ukraine’s president, Volodymyr Zelenskyy.

In a television interview that aired Sunday, Trump also said he would be open to reducing military aid to Ukraine and pulling the United States out of NATO. Those are two threats that have alarmed Ukraine, NATO allies and many in the U.S. national security community.

Asked on NBC’s “Meet the Press” if he were actively working to end the nearly 3-year-old Ukraine war, Trump said, “I am.”

He refused to say if he had spoken to Putin since winning election in November. “I don’t want to say anything about that, because I don’t want to do anything that could impede the negotiation,” Trump said.

Trump’s call for an immediate ceasefire went beyond the public policy stands taken by the Biden administration and Ukraine and drew a cautious response from Zelenskyy. It also marks Trump wading unusually deeply into efforts before his Jan. 20 inauguration to resolve one of the major global crises facing the lame-duck Biden administration.

Trump made his proposal after a weekend meeting in Paris with French and Ukrainian leaders in Paris, where many world leaders gathered to celebrate the restoration of Notre Dame cathedral after a devastating fire. None of the advisers traveling with him appeared to have expertise on Ukraine.

Kyiv would like to close a deal, Trump wrote on his social media platform Truth Social. “There should be an immediate ceasefire and negotiations should begin.”

“I know Vladimir well. This is his time to act. China can help. The World is waiting!” Trump added. He was referring to mediation efforts by China that many in the West have seen as favoring Russia.

Zelenskyy described his discussions Saturday with Trump, brought together by French President Emmanuel Macron, as “constructive” but has given no further details.

Zelenskyy cautioned that Ukraine needs a “just and robust peace, that Russians will not destroy within a few years.”

“When we talk about an effective peace with Russia, we must talk first of all about effective peace guarantees. Ukrainians want peace more than anyone else. Russia brought war to our land,” he said Sunday in a post on the Telegram messaging app.

Kremlin spokesman Dmitry Peskov responded to Trump’s post by repeating Moscow’s long-standing message that it is open to talks with Ukraine. Peskov referenced a decree by Zelenskyy from October 2022 that declared the prospect of any talks “impossible” as long as Putin was Russia’s leader.

That decree came after Putin proclaimed four occupied regions of Ukraine to be part of Russia, in what Kyiv and the West said was a clear violation of Ukrainian sovereignty.