In an interview with the Evening Standard, Gavin Williamson stressed that North Korea was a real threat to the UK.
North Korea claims it is considering strikes near US military installations in Guam.
Theresa May has told Japan that the UK will stand "shoulder to shoulder" with them over the threat from North Korea.
New Zealand is staging one of its largest exercises of the year to test its capabilities to respond to violent unrest and natural disasters in the Pacific island states.
In the wake of North Korea's recent threat to attack United States forces in the Pacific, Forecast International expects the THAAD missile system to play a pivotal role.
US Air Force and Marine Corps aircraft joined Japanese and South Korean military aircraft in response to the launch by North Korea of an intermediate range ballistic missile over Japan.
General Petr Pavel, Chairman of the NATO Military Committee visited Sydney and Canberra while in Australia.
Japanese Prime Minister Shinzo Abe has put in a a request of 5.2 trillion Yen or $48 billion dollars for 2018 which includes defensive measures including missile protection technology.