The number of countries China has invaded depends on historical interpretation and the definition of "invasion." During the Qing dynasty, China briefly invaded Vietnam (1789) and Burma/Myanmar (1765–69), but these were limited and didn't result in permanent occupation. Border conflicts with India and the Soviet Union did not involve foreign territory invasion.
Modern Chinese historiography often lists these as invaded/annexed at some point:
Many are disputed or resolved via treaties (e.g., China-Vietnam border agreements). Tibet's status remains sensitive internationally. Thus, the count varies by criteria and context.