Taiwan is an island which has for all practical purposes been independent since 1950, but which China regards as a rebel region that must be reunited with the mainland – by force if necessary. China has claimed sovereignty over Taiwan since the end of the Chinese civil war in 1949, when the defeated Nationalist government fled to the island as the Communists, under Mao Zedong, swept to power. Long-standing tension with the mainland has eased since the China-friendly President Ma Ying-jeou took office in May 2008. In July 2009 the leaders of China and Taiwan exchanged direct messages for the first time in more than 60 years, albeit in their respective party functions, and not as national leaders.