Japan Meteorological Agency reported an M3.9 earthquake around 10:58 a.m. on May 31 in southern Amami, Kagoshima Prefecture. Maximum seismic intensity was 3 on the JMA scale, hypocenter depth 50 km. No tsunami risk.

英国海事部门表示，美国对伊朗港口的封锁正在严格执行。霍尔木兹海峡附近船只的船长必须表明其无前往伊朗港口的意图。船只若不服从美国海军在霍尔木兹海峡的命令，将面临危险。

At the Shangri-La Dialogue (May 29-31 in Singapore), UK Defence Secretary John Healey said the UK will work with the United States and Australia under the trilateral security partnership to jointly develop new weapons for unmanned submersibles. The UK will allocate £150m (about $200m) to the project. The announcement builds on the 2021 AUKUS pact, under which the US and UK agreed to help Australia build nuclear-powered submarines—a move that has prompted regional concern; the IAEA warned it could set a dangerous precedent and trigger a chain reaction.