Slovakia has charged a former military academy officer and another man with espionage for Russia, police and a special prosecutor said on Tuesday.
The announcement comes a day after the NATO country expelled three Russian diplomats. Russia said it would respond to what it called an unjustified expulsion.
Acting police president Stefan Hamran told a news conference in Bratislava, shown live on television, that police had detained and charged a former vice-rector at a military academy, identified as Pavol B., with cooperating with Russian military intelligence GRU since 2013.