Russian President Vladimir Putin said Thursday that he agrees in principle with a U.S. proposal for a 30-day ceasefire in Ukraine, but he emphasized that the terms are yet to be worked out and noted that any truce should pave the way to lasting peace. “The idea itself is correct, and we certainly support it,” Putin told a news conference in Moscow. “But there are issues that we need to discuss, and I think that we need to talk about it with our American colleagues and partners and, perhaps, have a call with President Trump and discuss it with him.” President Donald Trump said there have been “good signals” coming out of Russia and offered guarded optimism about Putin’s statement. He reiterated that he stood ready to speak with Putin and underscored that it was time to end the war. Putin “put out a very promising statement, but it wasn’t complete,” Trump said Thursday at a start of a meeting at the White House with NATO Secretary General Mark Rutte. “Now we’re going to see whether or not Russia’s there. And if they’re not, it’ll be a very disappointing moment for the world.”