minsk belarus kgb state security service say monday uncover spy ring work ukrainian defence ministry set detain ukrainian radio correspondent minsk-based journalist pavlo sharoyko arrest october charge undercover intelligence officer kgb spokesman dmitry pobyarzhin say brief belarus sharoyko build network agents make belarussian citizens carry assignments monetary compensation pobyarzhin say adviser embassy minsk ukrainian ihor skvortsov declare persona non grata ban country believe sharoyko handler pobyarzhin say ukrainian defence ministry deny allegations sharoyko say work spokesman ministry switch journalism 2009. information contain kgb statement true say ukrainian foreign ministry decline immediate comment sharoyko skvortsov could reach comment case could put pressure relations minsk kiev test early year belarus host large-scale joint military exercise russia september zapad-2017 west-2017 war game unnerve ukraine nato member state europe eastern flank fear exercise could rehearsal cover real offensive belarus kgb say ukrainian journalist set spy ring minsk