Two senior US officials are travelling to Saudi Arabia to initiate peace negotiations between Russia and Ukraine.

Two sources familiar with the matter told Sky News' US partner network NBC News that national security adviser Mike Waltz and special envoy Steve Witkoff are on their way to Saudi.

On Wednesday, US President Donald Trump said there had been an agreement to begin negotiations about ending the war in Ukraine, after holding phone calls with Russia's Vladimir Putin and Ukraine's Volodymyr Zelenskyy.