President Donald Trump expressed optimism on Thursday that Russia will agree to a ceasefire in Ukraine, calling it a necessary first step toward ending the ongoing war. Speaking from the Oval Office alongside NATO Secretary-General Mark Rutte, Trump said he remains hopeful about the possibility of peace.

“We know where we are with Ukraine,” Trump told reporters, according to Fox News. “Hopefully they’ll do the right thing,” he added, referring to Russia.

His comments came shortly after Russian President Vladimir Putin gave a speech in Moscow, where he acknowledged Trump’s ceasefire efforts. Putin said he agreed with the idea “in principle” but stopped short of endorsing the 30-day proposal as it currently stands.

Trump, who was aware of Putin’s remarks at the time, described them as encouraging but not yet sufficient.

“He put out a very promising statement, but it wasn’t complete,” Trump said. “I’d love to meet with him or talk to him, but we have to get it over with fast.”

The president noted that Russia had raised concerns about issues like the Zaporizhzhia power plant and Ukraine’s potential NATO membership—topics Putin also referenced in his speech.

“A lot of the details of a final agreement have actually been discussed,” Trump said. “Now we’re going to see whether or not Russia is there. If they’re not, it’ll be a very disappointing moment for the world.”

Putin, in his remarks, acknowledged the U.S. ceasefire proposal and its potential but emphasized the need for deeper discussions to ensure a lasting resolution.

“We agree with the proposal for a ceasefire to cease hostilities, but we proceed from the fact that this ceasefire should lead to an enduring peace, and should remove the root causes of this crisis,” Putin said.