National Armed Forces reported that three ships had been sighted 5.5 nautical miles (10 km) from Latvia's sea border, within Latvia's exclusive economic zone, specifically three different types of corvette: a Nanuchka missile corvette, a Tarantul-class corvette and a ship of the Buyan-M class.
LV ekskl. ekonom. zonā 5 j.j. no terit. jūras bruņotie spēki 04.05.identif. Krievijas BS NANUCHKA kl., TARANTUL kl. un BUYAN-M kl. korvetes.— NBS (@Latvijas_armija) May 4, 2017
According to the Russian Ministry of Defense, the ships were en route to Saint Petersburg to participate in Victory Day celebrations on May 9.