China's military doctrine has long stressed the importance of taking pre-emptive action to achieve a strategic advantage. Moreover, in such conflicts as the Korean War (1950-1953), the war against India (1962), the seizure of the Paracel Islands in 1974 and the attack on Vietnam in 1979, China has claimed that it was conducting a 'self-defensive counterattack'. The PRC's military history, therefore, leaves open the question of what level of provocation may provoke the need for such an "active defence" in the future.
Didn't China complain about the preemptive defense doctrine of the US? hrm.