Kamala Harris insists US will respond aggressively on Ukraine after Biden flub

Vice-president warns of severe costs' for any Russian incursion after president's press conference raised doubts.

Kamala Harris has joined in on the White House's campaign to repair Joe Biden's flub on Ukraine in his press conference on Wednesday, where he revealed Nato is divided on how to respond to a minor incursion" from Russia.

The president of the United States has been very clear, and we as the United States are very clear: if Putin takes aggressive action, we are prepared to levy serious and severe costs. Period," Harris said in a Thursday morning appearance on NBC's Today Show.