A Russian court has arrested a dual Russian-Lithuanian national on treason charges.

A spokeswoman for Moscow’s Lefortovo District Court said Yevgeny Mataitis was arrested on June 25.

The court ruled to keep him behind bars until August 24, court spokeswoman Yulia Skotnikova said.

She added that she could not disclose any details because the case was "classified."

Interfax news agency cited unidentified sources as saying Mataitis is suspected of "gathering secret information and passing it abroad."

Russian authorities have charged a number of Russians with treason, espionage, or disclosing state secrets in recent months.

Last month, a Russian court charged a Lithuanian national, Arstidas Tamosaitis, with espionage and ruled to place him into custody for two months.

Based on reporting by AFP and Interfax