Waltz warns nations of consequences for defying Iran sanctions

U.S. Ambassador to the United Nations Mike Waltz stated that countries failing to enforce sanctions against Iran will face consequences, a warning issued ahead of President Donald Trump's address to the General Assembly. The diplomat emphasized that the enforcement mandate applies to both allies and adversaries, describing the pressure as essential for future global security.

The U.S.-Iran conflict has entered its seventh month, prompting Washington to intensify economic measures against Tehran. Waltz noted that the Iranian economy is deteriorating due to currency devaluation, high inflation, and a U.S. naval blockade. He reiterated the administration's position that Iran will not acquire nuclear weapons. These diplomatic efforts follow a September 17 vote in the U.N. Security Council where Russia and China blocked an initiative to continue independent monitoring of international sanctions.

European and Asian allies have largely resisted U.S. requests for direct military assistance in the conflict, which began with U.S. and Israeli strikes in February. The war has disrupted energy markets, with Iran obstructing shipping through the Strait of Hormuz and Houthi allies tightening control over Red Sea shipping corridors. Trump is expected to meet with Gulf leaders during the General Assembly to discuss regional security and hear their concerns directly.

The diplomatic push coincides with significant administrative changes at the United Nations. On September 16, the United States paid $725 million toward the U.N.'s regular budget and $102 million for peacekeeping operations. These payments reduced Washington's outstanding debt and prevented the immediate loss of its General Assembly voting rights in 2027, although the U.S. still owed approximately $1.312 billion to the regular budget. Waltz said the administration has secured over $1 billion in budget reductions, cutting roughly 3,000 headquarters positions and reducing peacekeeping personnel by about 25%. He described these measures as placing the organization on a diet while maintaining it as a primary venue for diplomacy.

The administration also announced a new security agreement with Denmark and Greenland aimed at expanding the American military presence in the Arctic. The deal restricts adversaries from establishing bases or making sensitive investments on the island, though it falls short of Trump's earlier goal of acquiring Greenland. Denmark and Greenland stated the arrangement does not compromise sovereignty or self-determination, with additional details yet to be made public. Waltz cited melting ice and new shipping routes as factors increasing the region's strategic importance.

Secretary of State Marco Rubio will be in New York from September 20 to 23 to meet with foreign counterparts. The U.N. expects 73 heads of state, 45 heads of government, and other senior officials to attend High-Level Week. The General Debate begins Tuesday and runs through September 28, with topics including Russia's invasion of Ukraine and the future of Gaza. Waltz framed the administration's approach as making the U.N. great again, focusing on whether allies will increase pressure on Iran and if a leaner U.N. can still address global security challenges.