Between Call of Duty 4 and Modern Warfare 2
2011-2016: The Russian Ultranationalists finally seize control of the country, celebrating Imran Zakhaev as a fallen national hero. A statue is erected in Red Square in his honour, and he gets an airport named after him. In all probability, he also gets a line of poseable action figures, too.
Vladimir Makarov, a former Spetznatz and one of Zakhaev's former high-ranking associates, rises to prominence within the Russian Ultranationalist movement. Over the next five years he begins arranging terrorist attacks against the West. Makarov has a personal grudge against Price and Soap, who he perceives to be directly responsible for the death of his mentor. And if you think about it, they were.
MacTavish rises through the SAS and becomes Captain, abandoning the "Soap" nickname as he's a big boy now and has to look authoritative. Meanwhile Price, having been caught by the Ultranationalists, languishes in a high security Russian gulag. Hardly anyone knows that Price survived the events of CoD 4, let alone that he's locked up.
Commander Shepherd becomes the ultimate leader of both the US Army Rangers and Task Force 141. While the name may suggest one of Louis Walsh's failed pop groups, Task Force 141 is actually an international counter-terrorist collective, made up of elite military specialists from around the world. Shepherd uses this group to hunt for Makarov.
However, Shepherd also has a secret agenda...