Estonian Foreign Minister Margus Tsahkna has accused a Russian fighter jet of violating NATO territory after the Estonian Navy attempted to intercept a tanker believed to be part of Russia 's so-called " shadow fleet. " The incident occurred on May 15, as Tsahkna made the claim while speaking in Antalya, Turkey, ahead of a NATO informal meeting, according to a report by Reuters. Tsahkna said the Russian aircraft was dispatched to " check the situation " after the tanker refused to cooperate