U.S. President Donald Trump's senior envoys Steve Witkoff and Keith Kellogg will travel to Istanbul for potential talks on Thursday on how to end the war in Ukraine, three sources familiar with the plans said on Tuesday.

Ukrainian officials say Russia launched more than 100 drones, rejecting calls for a ceasefire as Zelenskyy says he'll "be waiting for Putin" to join him for direct talks in Turkey.

Both Moscow and Kyiv each accused the other of violating a truce Ukraine had never agreed to — even as it prompted Ukraine, with backing from European leaders (France, Germany, the United Kingdom and Poland) and the United States (it seems), to demand an extended 30-day ceasefire from the Kremlin.

Trump said he might travel to Turkey for peace talks between Russia and Ukraine, for what he said could be an agreement for a 30-day cease-fire.

European leaders say Russia's failure to join a ceasefire offered by Ukraine would lead to further sanctions on Moscow.

The Kremlin brushed off the threat of further sanctions, saying that “the language of ultimatums is unacceptable.”