Denis Urubko, Kazakh mountaineer
Denis Urubko (Russian: Дени́с Ви́кторович Уру́бко; 29 July 1973) is a Russian-Polish mountaineer. In 2009, as a citizen of Kazakhstan he became the 15th person to climb all 14 eight-thousanders and the 8th person to achieve the feat without the use of supplementary oxygen. He had Soviet citizenship, but after the dissolution of the Soviet Union he became a citizen of Kazakhstan, but renounced the citizenship in 2012. In 2013, he received Russian citizenship and on 12 February 2015 he received Polish citizenship.