Russia’s president flattered his American counterpart as “smart” and “pragmatic,” and repeated Mr. Trump’s baseless claim that the 2020 election was stolen.

On his third day in office, U.S. President Donald Trump threatened to tighten sanctions on Russia if it does not move toward a peace deal with Ukraine. Here’s how the Kremlin responded, and what analysts are saying about the warning.

President Trump in a social-media post urged Russian President Vladimir Putin to make a deal, in his most forceful and public effort to end the war in Ukraine.