China will boost its defence spending by 7.2% this year, fuelling a military budget that has more than doubled under President Xi Jinping's 11 years in office as Beijing hardens its stance on Taiwan, according to official reports on Tuesday. China also officially adopted tougher language against Taiwan as it released the budget figures, dropping the mention of "peaceful reunification" in a government report delivered by Premier Li Qiang at the opening of the National People's Congress (NPC), China's rubber-stamp parliament, on Tuesday.