Iranian president criticises US siege as "doomed to fail", after President Trump warns the America's blockade on Strait of Hormuz could last for months. Also on East Asia Tonight: South Korea and Australia step up cooperation to secure energy supplies; and Taiwan activates backup communications for remote islands located near Chinese coast after undersea cables broke. 00:00 Headlines 01:45 Iran criticises US naval blockade 03:38 Australian FM Penny Wong in South Korea 06:15 Taiwan activates