Infinity Ward had previously stated that Modern Warfare's campaign was a work of fiction. In addition, they highlighted how in the game's cooperative Special Ops mode, which acts as a sequel to the campaign's story, the playable character and their group eventually ally with Russian forces for one of the missions.

Call of Duty 4: Modern Warfare is a 2007 first-person shooter video game developed by Infinity Ward and published by Activision. It is the fourth main installment in the Call of Duty series. The game breaks away from the World War II setting of previous entries and is instead set in modern times.

The only COD that you can play without a Core subscription is Warzone: //xbox/games/call-of-duty-warzone Besides that, every other COD and paid games, like FC24, GTA V, etc.