NEW : NATO chief says he ca n't confirm Russian withdrawal from area bordering Ukraine . Russia says one battalion is being pulled back from border region after finishing drills . U.S. officials say Russia may have as many as 40,000 troops near its border with Ukraine . Comment:
NEW : NATO chief says he ca n't confirm Russian withdrawal from area bordering Ukraine . Russia says one battalion is being pulled back from border region after finishing drills . U.S. officials say Russia may have as many as 40,000 troops near its border with Ukraine . NATO commander Gen. Breedlove says Russia has a sizable force that is `` very , very ready ''