Russia's Defence Ministry said on Wednesday the Russian warship Ivan Hurs had been attacked unsuccessfully in the early morning by three Ukrainian uncrewed speedboats in the Black Sea, on the approaches to the Bosphorus strait.
In a statement posted on Telegram, the ministry said the warship had been protecting the TurkStream and Blue Stream gas pipelines - which carry gas from Russia to Turkey, partly across the Black Sea - and "continues to fulfil its tasks".
The statement appeared likely to raise tensions in the Black Sea, where Russia only agreed last week, one day before a self-imposed deadline, to extend a deal allowing Ukraine to export grain safely from its seaports.