Two Russian jets that can drop 12.5 tons of water arrived on Sumatra island Wednesday to help douse Indonesia‘s massive forest fires that have spread smoky haze over parts of Southeast Asia.

The amphibious planes, leased by Indonesia‘s government and sent by Russia‘s Emergencies Ministry, can suck 13,250 liters (3,500 gallons) of water from a river or sea in seconds. Similar planes helped extinguish fires on Sumatra and Borneo islands in 2007.