>> reporter: roughly 100,000 russian troops are now deployed along russia's border with ukraine. u.s. officials say they believe russia is planning a multi--front military invasion as soon as next year, one that could involve as many as 175,000 troops. the deployment only intensifies fears of a war on european soil. >> there is a concern and there is talk about planning that the united states could end up on the wrong end of a two on one fast break, if russia moved on ukraine and china moved on taiwan, those things i think are a ripple effect of what happened in afghanistan and our other foreign policy disasters that have already taken place in just 10 short months of this administration. >> reporter: russian officials say that they have done nothing wrong, defending their stance, saying that the deployment of troops on their own soil is of no international concern. biden and putin have held one in-person meeting and they held their last phone call back in