The phone call between the two allies' top diplomats came one day after US President Donald Trump's call with Japanese Prime Minister Shinzo Abe.
The White House said Wednesday that the two leaders committed to coordinating closely in advance of the US-North Korea upcoming Hanoi summit.
Trump announced on February 8 that his second meeting with North Korea's top leader Kim Jong Un would take place in Hanoi of Vietnam on February 27-28.
--IANS vc