Taiwan is at the heart of a struggle between two nuclear powers – china and the united states - and there are fears it will become the next global conflict. president xi jinping insists taiwan is part of china and must re-unify with the motherland. but taiwan’s president, tsai ing-wen, says the island is already independent and must maintain its freedom and democracy. jane corbin investigates how the taiwanese government and young people are fighting what they say is chinese disinformation, cyber attacks and dirty tricks.