evidence: In June last year, Malaysia summoned China’s ambassador after 16 military aircraft flew over disputed waters off its eastern state of Sarawak. Malaysia’s foreign ministry said at the time that the manoeuvre was a "serious threat to national sovereignty". [...] In 1950, China enforced a long-held claim on the Himalayan country and incorporated it with its own territory. Following an unsuccessful uprising in 1959, Tibet’s spiritual leader, the Dalai Lama, fled to India, where he set up a government in exile.