An NBS tweet said the three ships were located nine nautical miles (17km) from Latvia's sea border and even named the vessels as the corvette 'Boikiy', the frigate 'Admiral Essen' and another corvette, 'Dimitrovgrad'.
"Steregushchy" klases korveti “Boikiy”; "Admiral Grigorovich" klases fregati "Admiral Essen" un "Tarantul" klases korveti "Dimitrovgrad"
— NBS (@Latvijas_armija) August 6, 2016
As previously reported by LSM, Latvia has just added an extra patrol boat to its contingent policing the sea border as a result of increased Russian naval activity in the area.