Commentary: Trump’s South Korea defence flip reminds Japan it has no Plan B

The recent remarks by US President Donald Trump have sparked concern in Japan about the reliability of US military guarantees, prompting the question of whether Japan should develop an alternative strategy. In an August 19 tweet, Trump called for a reduction in joint US military exercises with South Korea, ostensibly based on his relationship with North Korean leader Kim Jong Un.

Critics, including Japanese Prime Minister Suga Takaichi, have warned that any uncertainty in US support could force Japan to reevaluate its pacifist constitution and consider alternative defense plans. While Japan has historically depended on US military protection under the 1951 alliance, the country's commitment to pacifism has made the prospect of a "Plan B" nearly impossible.

Analysts suggest that while Japan has made strides in strengthening its defense capabilities, it still falls short of a fully realized Plan B.