ekranoplan
That's the Caspian Sea based JSC R.E. Alexeiev Central Hydrofoil Design Bureau's kit.
Smaller one is Orlyonok A90.125 with turboprop on fin. Larger one is Lun equipped with eight NK-87 turbofan engines.
Very interesting machinery! I built an 1/18th scale Power Augmented Ram WIGEC for university major project back in 1991. Flew it round the sports hall at 88km/h as well as windtunnel tested with ground board.
Maybe with increasing environmental pollution concerns and higher fuel prices we may see a comeback for WIGs in the next 50 years!