President of Ukraine by acting president Oleksandr Turchynov, who then also served as Chairman of the Ukrainian Parliament, on 21 February 2014. Oleksandr Turchynov was the only acting president in Ukraine's modern history. Unlike in the US, where the vice president immediately receives all powers of the presidency upon assumption of the presidential office, in Ukraine the powers of an acting president are severely limited. On 18 June 2015, Yanukovych was officially deprived of the title of president of Ukraine. The current president is Petro Poroshenko who took the oath of office on 7 June 2014. The Government of Ukraine utilizes a Semi-presidential
2014 Ukrainian revolution although the members of the Alpha team are Ukrainian citizens. On 21 February, President Yanukovych and Parliament declared 22 and 23 February to be days of mourning "due to the loss of human life as a result of mass disturbances". Speaker Rybak submitted his resignation in parliament on February 22, citing illness. Yanukovych's whereabouts were unknown, despite media reports that he had flown to Kharkiv (according to the governor of Kharkiv Oblast at the time, Mykhailo Dobkin, Yanukovych was in Kharkiv that day). Oleksandr Turchynov said that most of the ministers had disappeared, including Interior Minister Zakharchenko, who was reported