U.S. Secretary of State Marco Rubio discussed Russia's war in Ukraine with Czech foreign minister Jan Lipavsky on Monday as Washington and Europe seek to regroup following U.S. President Donald Trump's clash with Ukrainian president Volodymyr Zelenskiy last week.

Ukrainian leader said there had been contact between Kyiv and Washington since Friday's Oval Office bust-up, although not at his level Ukraine was ready to sign a minerals deal with the United States,

The fallout from the heated exchange sparked criticism from Ukraine-backing lawmakers as well as praise from Republican supporters of the U.S. president.

A summit of European leaders to discuss Ukraine's defense has been overshadowed by the diplomatic row at the White House

European allies are gathering again on Monday to try bolster support for Ukraine and build bridges between Kyiv and Washington after an Oval Office fiasco.