The 'Beriev Be-2500 Neptun' (
Cyrillic: Бериев Бе-2500 Нептун) is a super-heavy amphibian cargo aircraft concept being developed by the
Beriev Aircraft Company of
Russia. Its maximum takeoff weight is projected to be 2,500 metric tons, hence the designation.
It is designed to function as both a conventional high-altitude jet and as an
Ekranoplan. It is intended to fly transcontinental routes, taking off from conventional sea-ports and requiring no special infrastructure.
If it enters service, it will become the new largest aircraft in the world, surpassing another aircraft designed in a territory of the former Soviet Union, the
Antonov An-225.
Beriev claims that if this plane is to become a reality investments from several countries are needed.
Specifications (Be-2500)

Orthographically projected diagram of the Beriev Be-2500.
References
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Russian heavyweight stretches imagination Gregory Polek
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