Biden says he is crafting a plan for Russia-Ukraine crisis

FILE PHOTO: The national flag of Ukraine flies over the town of Kramatorsk, Ukraine November 25, 2021. Picture taken with a drone on November 25, 2021. REUTERS/Valentyn Ogirenko

WASHINGTON (Reuters) -U.S. President Joe Biden said on Friday he is developing comprehensive initiatives to make it difficult for Russian President Vladimir Putin to invade Ukraine and that he would not accept Moscow's "red lines," as fears mounted that the simmering conflict could erupt into war.

A video teleconference between the two leaders is anticipated within days.