Heads of state from Europe, Asia, and the Gulf held a flurry of emergency phone calls through Sunday as governments scrambled to assess the scope of the newly opened conflict involving Iran and to coordinate the first international responses.

European Union member states convened a closed videoconference of foreign ministers, with officials in Brussels describing the meeting as focused on aligning messaging and identifying immediate consular needs for citizens in the region. Several governments activated crisis cells and began advising nationals against travel to wide swaths of the Middle East.

The United Kingdom, France, and Germany released near-simultaneous statements calling on all parties to exercise maximum restraint and warning against further escalation. Officials privately acknowledged that diplomatic leverage was limited in the opening hours and that the focus had shifted to managing humanitarian and economic spillover.

In East Asia, leaders in Tokyo and Seoul ordered standing reviews of energy supply continuity and confirmed that diplomatic missions in the region were operating on emergency footing. Officials emphasized the dependence of their economies on Gulf crude and the need to maintain freedom of navigation through regional waterways.

China issued a measured statement urging immediate de-escalation and dialogue, while quietly contacting both Iranian and U.S. counterparts. Analysts said Beijing was likely to weigh its energy interests and its diplomatic standing in the region carefully, avoiding any posture that could complicate its economic position.

Russia called for an emergency meeting of the United Nations Security Council and indicated it would table a draft statement urging an immediate cessation of hostilities. Officials in Moscow framed the conflict as a failure of Western diplomacy, signaling an intent to use the crisis to expand their own diplomatic profile in the region.

Gulf monarchies coordinated through the Gulf Cooperation Council, with officials emphasizing protection of critical infrastructure and the avoidance of any actions that could draw their territories directly into the fighting. Several governments deployed additional internal security around energy facilities and waterways.

Diplomats from Switzerland, Oman, and Qatar — long-standing back-channel actors between Western capitals and Tehran — were reported to have been in continuous contact with their respective counterparts. Officials in those capitals declined to characterize the substance of the calls but acknowledged an intensified pace of activity.

Foreign ministries across the wider region instructed embassies in conflict-adjacent capitals to limit non-essential operations and to prepare drawdown plans should conditions deteriorate further.