Southeast Asian countries are highly affected by oil supply shortages caused by the Iran war and the Strait of Hormuz closure.

Southeast Asian nations are “deeply concerned” about the impact of blockades of key maritime trade routes in the Middle East, their top diplomats have said.

Foreign ministers from the Association of Southeast Asian Nations (ASEAN) and their key ⁠partners met in the Philippines on Tuesday against a backdrop of instability due to the global impact on trade and energy supplies caused by the US-Israel war on Iran and the closure of the Strait of Hormuz, as well as territorial disputes with Beijing in the South China Sea.

Southeast Asian countries have a combined gross domestic product (GDP) of $3.8 trillion but are highly exposed to supply limitations caused by the blockade of the Strait of Hormuz, as they are heavily dependent on Gulf countries for their oil imports.

At the ongoing ASEAN summit in Manila, heads of state and top diplomats from the region are seeking to agree on an oil-sharing mechanism to mitigate the impact of the war on Iran.

Yemen’s Iran-aligned Houthis announced a naval blockade on Saudi Arabia on Monday, opening a potential new front in the war and risking aggravating the threat to global energy supplies and trade beyond the Gulf.

“We are deeply concerned that these ‌developments severely undermine the ongoing efforts of key mediators and diminish the prospects for a peaceful resolution through dialogue and diplomacy,” ASEAN ministers said in a statement.

Top diplomats from the United States, Russia and China are also attending the ASEAN summit, another reminder of how the war on Iran is reshaping international diplomacy and the global energy supply.

Reporting from Manila, Al Jazeera’s Barnaby Lo said the war has driven up oil and gas prices in Southeast Asia while also stalling manufacturing and exports, causing countries from the region to find new trade partners.

“Southeast Asia is thousands of kilometres away from the Middle East, but it has been one of the most impacted regions by the conflict because of how dependent many of its member nations are on oil from the Middle East,” Lo said.

“Take, for example, the Philippines: it’s the first country in the world to declare a state of national energy emergency, and it still is in this state, so it is fighting problems on two fronts. One on supply, the other on skyrocketing fuel prices,” Lo said. “On supply, it’s gotten oil from non-traditional partners, such as Russia and China, but on skyrocketing prices it has very little it can do because the prices here are driven by market forces.”

Other key issues to be discussed at the ASEAN summit include the civil war in Myanmar, as the bloc’s peace initiatives falter, five years after a military coup plunged the country into a conflict that has killed an estimated 100,000 people.

“Ahead of the summit, ASEAN foreign ministers held an in-person meeting – the first since 2021 – with the foreign minister of the military-backed government in Myanmar in Bangkok,” Lo reported. “This was criticised for legitimising the military junta in Myanmar.”

Top diplomats are also likely to discuss ⁠tensions in the South China Sea, with ASEAN countries and China still trying to conclude a code of conduct to ⁠prevent disputes after nearly 10 years. In advance of the summit, China and the Philippines were engaged in a feud after a confrontation between their vessels in disputed waters left a Filipino sailor injured.

The US Department of State condemned what it described as China’s “dangerous and aggressive” actions, and its “troubling pattern of provocation against lawful Philippine maritime operations”.