If a fight broke out today in the Baltics, Russian attack helicopters, IFVs, and even some tanks could employ ATGMs with an effective range that could penetrate the armor of most if not all NATO combat vehicles, including the U.S. M1 tank. The M1s might maintain a slight advantage in the close-in fight, if they survived to get there. But given the current U.S. posture, there would at best be only a few dozen on the field, compared to about 450 Russian. The Baltic states themselves have no heavy armor, and our analysis indicates that no other European heavy forces could make it to the frontlines in time to influence the outcome of a short-warning Russian assault.
http://warontherocks.com/2016/04/outnumbered-outranged-and-outgunned-how-russia-defeats-nato/