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