A Ukrainian Mi-8 helicopter has crashed in the Black Sea, killing 19 people, Russia's Itar-Tass news agency reports.
The crash happened when the Mi-8's tail section struck an offshore gas drilling platform early on Monday, officials at Ukraine's Naftogaz energy firm said.
One person on board the helicopter survived, Itar-Tass reported. It was carrying 20 people at the time.
Last month 12 people died when a helicopter of the Ukrainian border guards crashed into the Black Sea.
Mi-8 helicopters have long been used widely in the former Soviet Union for civilian and military flights.