"Today is the birthday of Oleg Sentsov. He marks 40 years old today, and he has spent in prison more than two of them. He is a hostage of Moscow. Oleg, I thank you for not having broken. You remain loyal to your principles and have become the symbol of invincibility of the spirit," Poroshenko wrote. President also noted that Ukraine had been doing and would do everything possible to free Sentsov, as well as the rest Ukrainian political prisoner. As reported, the Russia’s North-Caucasian military district court sentenced Ukrainian filmmaker Oleg Sentsov and activist Oleksandr Kolchenko to 20 and 10 years in prison on terrorism charges in August 2015.