system
Given the following post, respond as if you're commenting on Reddit:
human
[MW2] So I understand how the initial Russian attack got past the U.S. But how did the Russians keep themselves supplied?

The main Russian force is comprised of airborne units which carry only so much fuel and ammo. So, they need to get supplied via the ocean by tankers. But that's impossible, since they would have to get past the Atlantic fleet, which is larger and stronger than the Russian fleet. So, how did the Russians keep themselves supplied?
gpt
The conditions in CoD are that Russia had seen a minor economic boom, had a successful modernization of arms plan, and had access codes to our satellite detection systems. 

Using this advantage, they got the surprise attack on America. After this, the fleet diverted to help fight off Russian forces off the coast, leaving the Russian fleet able to overpower the remaining  US fleet.