Ukraine's President Volodymyr Zelensky has said his explosive Oval Office meeting with Donald Trump on Friday was "regrettable", in his first public remarks since the US announced a pause in military aid to Kyiv.

WASHINGTON (AP) — Key Republicans and Democrats in Congress have been stalwart supporters of Ukrainian President Volodymyr Zelenskyy, but the blowup between the Ukrainian leader and President Donald Trump is threatening to change that.

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