Vilnius said Wednesday it was summoning Moscow's diplomatic representative over Russia's plans to unilaterally extend its maritime border into Lithuanian and Finnish waters, warning the move could be part of a hybrid warfare campaign, SİA reports citing foreign media.
Lithuania's foreign ministry said it was "summoning a representative of the Russian Federation for a full explanation".
Lithuania expelled Russia's ambassador and downgraded its diplomatic relations with Moscow in April 2022 in response to atrocities discovered in the Ukrainian town of Bucha.
Finland's Foreign Minister Elina Valtonen meanwhile told reporters that Helsinki was "following the situation".
"We don't have any official information of what Russia is planning," she said.
According to a draft resolution drawn up by the Russian defense ministry and published on Tuesday, Moscow plans to extend its territorial waters by changing its maritime border in the Baltic Sea with Finland and Lithuania.
The redefinition of geographical coordinates would see Moscow declaring Finnish and Lithuanian sea areas as Russian.