The U.S. envoy is set to discuss with Russia how to end the war President Vladimir Putin began, U.S. President Donald Trump said.

Witkoff heads to Russia amid building frustration in the White House, with six months of diplomacy under Trump having failed to achieve a peace deal -- or even a ceasefire -- to end Moscow's full-scale invasion of its neighbor, which began in February 2022.

President Trump has given an ultimatum to President Vladimir V. Putin of Russia to end the war in Ukraine or face U.S. sanctions.