Nations comprising the OPEC+ coalition of oil-producing countries are warning that attacks on energy infrastructure, and disruptions to international maritime routes are stoking market volatility and threatening the stability of global oil supplies.

In an April 5 release, the group — which includes Saudi Arabia, Kuwait, United Arab Emirates, Russia and Iraq — stopped short of referencing the ongoing Iran conflict explicitly, but made it clear that disruptions to maritime routes and global supplies have been making it harder to keep oil flowing steadily to the rest of the world.

“The eight countries expressed concern regarding attacks on energy infrastructure, noting that restoring damaged energy assets to full capacity is both costly and takes a long time, thereby affecting overall supply availability," the release said. 

OPEC+ also announced that it would be raising its oil production quotas by 206,000 barrels per day, although the move is largely symbolic, given that limits to traffic through the Strait of Hormuz continue to choke off the critical artery for global oil shipments out of the region.

This comes after U.S. President Donald Trump threatened to attack energy infrastructure and bridges in Iran, if the nation doesn't agree to fully reopen the Strait of Hormuz by April 7. However, Trump has repeatedly made similar threats accompanied by deadlines that came and went with little follow-through, leaving markets and world leaders unsure how seriously to take the latest ultimatum.

Ukraine reportedly attacked a Russian oil refinery and Baltic Sea port facility on April 5 as well, further adding to concerns regarding threats to production capacity for OPEC+ nations. According to Al Jazeera, the refinery hit by Ukrainian drones is Russia's second largest producer of petrol, while the Baltic port is a vital hub for transporting oil.