China will be forced into retaliating against the US in a confrontation over the "red line" of its Taiwan policy, a defence expert has said.
After the second most powerful lawmaker in the US landed in Taiwan last night, China launched into action - with a burst of military activity in the waters surrounding the self-ruled island.
US House of Representatives Speaker Nancy Pelosi's visit has infuriated Beijing with President Xi Jinping's government summoning America's ambassador to the capital this morning.
