“Thanks to the Prime Minister of Poland Mateusz Moravetsky for the decision to refuse the Russian sailboat Sedov to enter the territorial waters of the country,” he wrote.

Dyakumo for the premier-prime minister Mo @ MorawieckiM russia marry Russian sailboat "Sєdov" to go to the territorial waters of the RP. DiCi #CrimeaIsUkraine

- Pavlo Klimkin (@PavloKlimkin) April 12, 2019

At the same time, the diplomat reiterated that Crimea is part of Ukraine, and Russia "must be held responsible for its illegal actions."

It became known earlier that Poland did not allow the sailboat “Sedov” to enter its territorial waters, on board of which are cadets of the Kerch State Marine Technological University.

Crimea became the Russian region after the referendum held there in March 2014, in which the majority of residents spoke in favor of reunification with Russia.