Top diplomats from Japan, the U.S., Australia and India meeting Monday in Tokyo compiled a set of measures to reinforce maritime safety and cybersecurity and to support other Asia-Pacific countries in improving their defenses during growing tensions in the regional seas.

After the meeting, host Japanese Foreign Minister Yoko Kamikawa, U.S. Secretary of State Antony Blinken, Australian Foreign Minister Penny Wong and Indian External Affairs Minister Subrahmayam Jaishankar said they were "seriously concerned" about the tensions and expressed "strong opposition" to unilateral changes to the status quo by coercion.