WASHINGTON, Feb 25 (CNN) - United States President Joe Biden has instructed Secretary of State Antony Blinken to release up to $350 million in immediate support to Ukraine's security and defense, according to a new memo released by the White House late Friday.

This is the third drawdown of money; previous orders have been for $60 million and $250 million, putting the total over the last year at over a billion dollars, according to an administration official.

The State Department is expected to issue its own statement with more details shortly.

This release comes after a 40-minute call between Biden and Ukrainian President Volodymyr Zelensky earlier Friday, during which they discussed "concrete defense assistance."