U.S. President Donald Trump said on Sunday that "big progress" has been made in negotiations with Russia, urging the public to “stay tuned” in a brief Truth Social post that offered no further details. The announcement comes two days after Trump’s summit with Russian President Vladimir Putin in Alaska. Following that meeting, Trump’s special envoy Steve Witkoff told CNN that Moscow had offered “some concessions” covering the five Ukrainian regions currently under Russian control—Donetsk, Lugansk, Kherson, Zaporizhzhia and Crimea—and that the sides were discussing “strong security guarantees.” Neither the Kremlin nor Kyiv has publicly confirmed those claims. Trump plans to host Ukrainian President Volodymyr Zelensky and several European leaders at the White House on Monday, a gathering the administration says could pave the way for a trilateral summit involving Russia and Ukraine. The White House has not released specifics of any draft agreement, leaving the scope and durability of the reported progress unclear.