(CNN) -- Latvia expelled a Russian diplomat Monday on the grounds that the man "poses a threat to state security," the government said.
The Latvian Ministry of Foreign Affairs said in a statement that authorities summoned the Russian ambassador Monday and issued him a note that said one of his staff members had engaged in "activities incompatible with his status as diplomat."
The ministry's statement, posted on its Web site, did not identify the diplomat nor elaborate on his alleged activities.
The prime minister of Latvia, Ivars Godmanis, said the expulsion would not affect relations with Russia, according to Latvia's National News Agency.
The Russian news agency ITAR-TASS carried news of the expulsion but included no comments from Russian authorities.
Latvia, a Baltic state that shares an eastern border with Russia, declared its independence from the former Soviet Union in 1991. E-mail to a friend 
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