We bring 100,000 troops from the Romanian Front. We use Coastal, and Artillery Batteries to force the soviets to entrench inland. We then go to the coastal area (not the beach where the ships are), and cut them off from their troop transport and supply ships. We then, intercept any and all supplies to starve them out. We send out a Submarine Fleet to target troop transport and supply ships. Tell them to disregard the main fleet. Once they are encircled, place hidden Coastal Batteries on the cliffs around the beach and have them fire on the Soviet Fleet to make them leave.
Green is Submarine Fleet, Blue is Army, and red is defensive line.