It's a plane! It's a boat! It's a tank! No, it's the Project 903 Lun Missile Launcher Ekranoplane!in reference to:
"In 1989, after the tragic accident on nuclear submarine "Komsomolets" where 42 mariners died, the decision was made to re-equipment the second "Lun", being at that time under construction, into a search-and-rescue maritime ekranoplane "Spasatel". The second copy of "Lun" had 6 engines, instead of 8. A considerable part of the work had already been accomplished by the time of the breakup of the Soviet Union, followin which there was a drastic reduction of the budget of the Russian Navy."
- Lun Class Ekranoplane - Project 903 (view on Google Sidewiki)