HONG KONG, CHINA (AFP) — Asian stocks tumbled with the South Korean won Monday while the safe haven yen rallied on news that North Korea had tested what it claimed was a miniaturized hydrogen bomb, ramping up tensions on the peninsula. Less than a week after it rattled global markets by firing a rocket over Japan, Pyongyang on Sunday conducted its sixth nuclear test, sparking further condemnation and a warning from defence secretary Jim […]