(Reuters) - French President Emmanuel Macron and British Prime Minister Keir Starmer will visit Washington next week, amid other meetings aimed at bringing an end to Russia's war in Ukraine, U.S. national security advisor Mike Waltz said on Wednesday.

But the risks of the prime minister's trip are huge. The famously thin-skinned president could take offence at Sir Keir's outright contradiction of his claim that Zelensky is a dictator. He could be irritated by Sir Keir's insistence that any European reassurance force deployed to Ukraine must have a US "backstop", expected in the form of aircover.

French president is headed to Washington on Monday. U.K. prime minister will follow on Thursday.

The US Commander in Chief has continued to rage against Europe in his latest interview, this time targeting nuclear leaders Sir Keir and President Emmanuel Macron

President Donald Trump holds talks this week with the leaders of France and the UK at a moment of deep uncertainty.

The prime minister says a "US security guarantee is the only way to effectively deter Russia from attacking Ukraine again".

Political and military leaders in Europe are fleshing out details of a plan for European forces to help ensure Moscow does not attack Ukraine again once the guns fall silent.