Japanese here. Caved is not an accurate expression. After intense negotiations with Trump, Lutnick, and Bessent, Minister Akazawa managed to reduced the tariff from the proposed 25% to 15%. His story of flying weekly to the States on commercial aircraft became legendary.

PM's resignation stemmed from unpopularity not due to tariff negotiation, but diminished ability to pass laws after the ruling party lost significant number of seats in elections for upper and lower houses.

As for other countries around the world, the world-wide inflation caused many ruling parties to lose support.