WASHINGTON —The Obama administration signaled Monday it no longer recognizes Viktor Yanukovych as Ukraine’s president.

The shift of support for opposition leaders in Kiev came even as U.S. officials sought to assure Russia that it does not have to be shut out of a future relationship with a new Ukrainian government.

U.S. officials said the International Monetary Fund was considering an aid package as high as $15 billion to help stabilize a new, transitional government in Kiev. White House spokesman Jay Carney said the U.S. would provide additional aid to complement the IMF, aimed at fostering Ukrainian economic stability.