Gorbachev was in increasingly poor health; in 2011 he had spinal operation and in 2014 oral surgery. In 2015, Gorbachev ceased his pervasive international traveling. He continued to speak out on issues affecting Russia and the world. In 2014, he defended the Crimean status referendum that led to Russia's annexation of Crimea. He noted that while Crimea was transferred from Russia to Ukraine in 1954, when both were part of the Soviet Union, the Crimean people had not been asked at the time, whereas in the 2014 referendum they had. After sanctions were placed on Russia as a result of the annexation, Gorbachev spoke out against them. His comments led to Ukraine banning him from entering the country for five years.