NEW : About 150,000 personnel are participating in the exercises , Russia says . Comment: But a senior administration official says military exercises are raising concerns . Russian military activity levels observed by the United States also `` appear to be within normal range , '' the official said . ` ` Let 's see no provocative actions by anyone , '' U.S. defense secretary says .
NEW : About 150,000 personnel are participating in the exercises , Russia says . Comment: But a senior administration official says military exercises are raising concerns . ` ` Let 's see no provocative actions by anyone , '' U.S. defense secretary says .