National Disaster Mitigation Agency spokesman Sutopo Purwo Nugroho says the two Beriev Be-200 amphibious planes, leased by Indonesia's government, landed today in Palembang, the capital of South Sumatra province.
The planes, sent by Russia's Emergencies Ministry, can drop 12.5 tons of water. They can fly about 645 kilometres per hour and suck 13,250 litres of water from a river or sea in seconds.
Indonesia has been unable to put out the rugged forest fires, especially in peat-rich provinces on Sumatra and Borneo.