Agencies reported that the Antonov-26 belonging to Kamchatka Aviation Enterprise lost contact amid difficult conditions.
The search lasted three and a half years and was the most expensive in history.
The families of the MH370 victims have long pushed for the search for the missing plane to be extended, but whether Friday's news will change anything for them remains unclear.
A year on from the disappearance of Malaysia Airlines Flight MH370, an extraordinary amount of key data remains unknown.
The teams have found the fuselage and now are focusing in on the black box
The plane's black box has yet to be located
The rescuers have reported sighting bodies and luggage near a Borneo island
Hope to recover the plane has quickly disappeared as the search continues
The flight, traveling from Surabaya, Indonesia, to Singapore, has been missing for just over 24 hours.