US President Donald Trump is set to discuss the Strait of Hormuz with Japanese Prime Minister Sanae Takaichi, and may face a similar situation as South Korea and Japan face questions about their mutual defensive obligations as the US seeks support from its allies in the war on Iran. This comes after Trump initially urged the UK, China, France, Japan, and South Korea to send warships to the strait, which has remained de facto closed since the US launched its war with Israel on Tehran on March 28. However, observers suggest that US allies may not yet be out of the hot seat. Although Japan and the US share a mutual defence treaty, Tokyo's constitution restricts its Self-Defense Force deployment. South Korea's decision to cap domestic fuel prices to prevent rising too quickly for consumers may also be a consideration.