While recent global attention has focused on the Strait of Hormuz , which Iran has effectively held closed since late February in a move that has disrupted world energy supplies, a quieter but also important development has been taking shape in south-east Asia. On April 14, the US and Indonesia announced a “ major defence cooperation partnership ”, strengthening their military ties. According to reports, the US is also seeking to gain wider access to Indonesian airspace. Several media outlets say Indonesia’s president, Prabowo Subianto , has approved the proposal. These developments matter because Indonesia’s vast archipelago sits astride some of the most critical sea routes in the world. These include the Strait of Malacca, an important chokepoint for global shipping and trade. The region surrounding Malacca has seen growing military attention from outside powers in recent years. Both the US and China have been steadily expanding their military presence around the strait and its approaches.…