A total of 24 out of 50 buoys placed to mark sailing routes were removed in the early hours of Thursday.
The European Union has denounced Russia's removal of buoys marking the border with Estonia on the Narva River.
A total of 24 out of 50 buoys placed to mark sailing routes were removed in the early hours of Thursday.
Tensions over the border have risen since Russia's full-scale invasion of Ukraine in 2022.
EU foreign policy chief, Josep Borrell, has described the act as unacceptable.
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