U.S. President Joe Biden said Friday he is "convinced" that Russian President Vladimir Putin has decided to invade Ukraine following a massive military buildup near its borders, but he noted that diplomacy is not yet off the table.As tensions simmer over the Ukraine crisis, the Russian Defense Ministry said it will conduct massive military drills involving its nuclear forces on Saturday.In the latest show of Western unity, Biden and European leaders agreed during a phone call to continue pursuing diplomacy to de-escalate tensions, while reiterating their warning that Russia will face "swift…READ FULL ARTICLE