The move will be Tokyo's biggest show of naval force in the region since World War II.
Pyongyang's latest missile launches and the assassination of Kim Jong Un's estranged half-brother have added urgency, driving home the need for Washington to confront the security challenge.
The war games are an annual military exercise carried out by the U.S. and South Korea.
China objects to the deployment in South Korea of the THAAD, as the radar is capable of penetrating Chinese territory.
Lindsey Graham, Chris Murphy both tell Munich conference that the nuclear deal doesn't prevent the U.S. from imposing additional penalties.
Pyongyang has said any sanctions against its missile or nuclear programs are a violation of its sovereignty.
Additional sanctions or shows of force are the most likely responses to North Korea's provocation.
Kim Jong Un had warned that the nation was close to test-launching a ballistic missile.
President Xi Jinping is overseeing an ambitious military modernization program that includes stealth jets and aircraft carriers.
The Kremlin is not concerned by a reported border deployment but parliament promises response.
Sanctions tell U.S. allies that America understands and condemns Russian action.
Putin is keeping an eye on proceedings and reports suggest Russian missile defenses in Crimea are at the ready.
John Bolton wants to bomb Iran and wage war against Cuba.
Most heads of state are offering sympathetic statements; each is a moral outrage.
Moscow has been working on missiles to overwhelm defences.
The U.S. could simply provide military equipment and logistical support to its European allies.
Rostec says it logged thousands of suspicious cyber-incidents last year.
How should we retaliate for the missile strikes against U.S. ships?
Russia and Japan have pursued a diplomatic solution, but Moscow is shoring up defenses.
Iskander units were drafted in the exercise close to the Estonian border.