With Friends Like These.

Oman has been friendly with the United States for a very long time. The two countries signed a Treaty of Amity and Commerce in 1833, which ought to be good for at least a birthday card. Formal diplomatic relations followed in 1972, and the defence relationship has since given American forces access to strategically useful Omani ports and facilities. Oman has also performed another service Washington has repeatedly found useful: it talks to Iran. This requires Oman to maintain relations with people the United States does not much like. That is generally the point of an intermediary. President Trump has now found a possible difficulty with this arrangement.

Asked about Omani negotiations with Iran over the Strait of Hormuz, Trump told Fox News that if Oman "gets in the way," America would "bomb the shit out of them." He later told reporters that Oman had not behaved very well and could be dealt with "very easily." There are diplomatic notes, démarches and stern conversations behind closed doors.

The threat is worth lingering over because Oman is not some newly discovered enemy beside the Strait. It is a longstanding American security partner occupying one of the most strategically useful pieces of coastline on Earth, and its usefulness to Washington has rested partly on its ability to speak to Tehran when Washington cannot speak to Tehran itself. Oman and Iran are currently negotiating arrangements to restore commercial shipping through the Strait. That independence has produced the curious spectacle of the United States threatening to bomb a country for doing the exact job Washington has always paid it to do.

At the time of writing, Oman had issued no direct public response. Its Foreign Ministry was busy publishing statements on other regional matters, including its commitment to freedom of navigation through Hormuz. Perhaps Muscat understands something Washington has temporarily forgotten: diplomacy becomes difficult once everybody is dead.

Far to the east, South Korea has encountered a less explosive version of the same problem. Trump announced he had ordered the Pentagon to "substantially reduce" American participation in the Ulchi Freedom Shield exercises with South Korea. These are the annual drills through which American and South Korean forces practise what they would actually do if the Korean Peninsula stopped being merely alarming and became catastrophic. Trump complained about the cost. He also said the exercises sent an inappropriate and hostile signal to North Korea, which he described as "unthreatening and respectful" during his presidency, citing his "very good relationship" with Kim Jong-un. This assessment may have come as news to South Korea. It may also have surprised anyone monitoring North Korean ballistic missiles, nuclear weapons, or the substantial army still positioned on the other side of the Demilitarized Zone.

There was another detail. Trump said he had recently asked South Korea whether it wanted to join the United States in the "denuclearization" of Iran, and that Seoul's answer was: "No thanks." He described this as somewhat unrelated to his decision on the exercises. Somewhat is doing strenuous work here. The drills nevertheless began on August 17 as scheduled, with the precise American reductions still unclear, which is it own small joke.

The exercises themselves are easily misread as a favour Washington performs for Seoul. They are not. American forces train in Korea because fighting in Korea is nothing like training in California, and armies generally prefer discovering that during an exercise rather than during a war. For decades the American alliance system has operated on a simple proposition: countries accept obligations to one another because their interests broadly coincide, and they can disagree about individual conflicts without the alliance itself becoming the disagreement. South Korea declined to help with Iran. Soon afterwards, Trump complained about the cost of defending South Korea and scaled back the exercises meant to deter the dictator he'd just praised. Perhaps these events are unrelated. Diplomats are paid to say such things with straight faces.

Put Oman beside South Korea and the pattern is hard to dismiss. Pursue your own diplomacy with Iran, and Washington threatens to bomb you. Decline to help with Iran, and Washington quietly downgrades the arrangement that was supposed to protect you from someone else entirely. Neither country is abandoning the United States. The more important point is who else is making notes.

Japan will have noticed what happened to South Korea. The Gulf states will have noticed what happened to Oman. And on the Sunshine Coast, where the closest most of us come to strategic geography is arguing about the Bruce Highway upgrade, it is worth remembering that Australia has built much of its own defence policy on the same assumption Seoul just had corrected, that being an ally does not mean underwriting every mood the President has. AUKUS commits us rather further than a joint exercise: submarines, technology transfer, an increased US presence in Western Australia, all resting on the premise that Washington's word holds regardless of what else is happening that week. Canberra's own 2026 Defence Strategy talks about greater self-reliance. It is being built, rather trustingly, in partnership with the one ally who has just demonstrated what happens when you decline to fall in line.

The United States possesses something China and Russia have spent years trying to approximate: a network of countries willing to hand over military access, intelligence and strategic geography because American power still beats the alternative. Oman provides a door onto the Strait of Hormuz while keeping a line open to Tehran. South Korea hosts 28,500 American troops beside one of the most heavily armed states on Earth. These are not small favours. Threatening the people doing you the favour is an unusual way of keeping them.

Nothing dramatic need happen next. Oman will keep talking. South Korea will keep training. Australia will keep calling America its indispensable ally, and mean it, mostly. The change, if it comes, won't arrive as an announcement. It will arrive as a footnote in someone's defence planning, the moment a country that once treated Washington's word as load-bearing quietly starts building around the possibility that it isn't. For generations, becoming an American ally meant gaining some protection from America's enemies. The latest innovation is wondering whether you might also require protection from America.