The USSR had a number of rather advanced and specialized amphibious attack systems. Pictured is a hovercraft landing ship, and one of it's many PT-76 amphibious tanks. The PT-76 was designed specifically to attack beaches and cross shallow water in conjunction with an invasion force.
So, considering their various weapon systems, would they have ever been a competent threat to a western power in direct combat? I've often wondered how that would turn out.

