NATO sees significant pullback of Russian troops from Ukraine
"There has been a significant pullback of Russian conventional forces from inside Ukraine, but many thousands are still deployed in the vicinity of the border," Lieutenant-Colonel Jay Janzen said in an e-mailed response to a request from Reuters for comment.
"Some Russian troops remain inside Ukraine. It is difficult to determine the number, as pro-Russian separatists control several border crossings and troops are routinely moving back and forth across the border. Further, Russian special forces are operating in Ukraine, and they are difficult to detect," he said.
(Reporting by Adrian Croft; editing by Julia Fioretti)