(KUPIANSK, KHARKIV OBLAST, UKRAINE) – Russian forces remaining in Kupiansk are increasingly confined and face sharply narrowing options as Ukrainian troops continue a slow and methodical operation to regain full control of the city, according to Ukrainian military officials. Viktor Trehubov, head of communications for Ukraine’s Joint Forces Group, said that most of the remaining Russian troops inside Kupiansk have now been compressed into a single downtown block. He said this situation reflects encirclement rather than any organised tactical withdrawal…