"I think it's one idea for the future. It's difficult to immediately set up a mechanism that would impose mutual defense obligations in Asia," Japan's top diplomat, Foreign Minister Takeshi Iwaya, told reporters in Tokyo Wednesday.
U.S. officials have also demurred, with Daniel Kritenbrink, assistant U.S. secretary of state for East Asia and the Pacific, saying the proposal is premature.
https://www.newsweek.com/japan-prime-minister-ishiba-pushes-nuclear-weapons-asian-nato-1963059