Donald Trump’s special envoy for Ukraine, Keith Kellogg, has urged Washington’s chief negotiator with Moscow, Steve Witkoff, to consult European leaders before placing trust in Russia’s President Vladimir Putin. Witkoff has been part of U.S. delegations leading talks with Moscow and Kyiv since February, after Trump tasked members of his administration to help negotiate an end to Russia’s three-year war in Ukraine. However, he has faced criticism from Kyiv for peddling Russian narratives, including a suggestion to hand over four partially occupied eastern Ukrainian regions to Moscow. In March, Witkoff said that Putin has no intention to “take all of...