As a further example of how Russia could still be a major player, my friends and I started a T2K campaign about 5 years ago where WWIII started during the Kosovo war. If anyone recalls, the Russians were pretty ticked off about "capitalists" and/or "imperialists" imposing their will on Yugoslavia and the Slavic world in general, ranging from the Bosnian peacekeeping efforts to Poland, the Czech Republic and Hungary poised to join NATO. The Russians occupied the Pristina airport, obstensibly to "maintian order". In reality, by putting boots on the ground, they made themselves very relevant to any NATO military action in Kosovo by: 1)Denying NATO a strategic staging area that would definitely have been desireable piece of real estate if ground operations were to commence, 2) Giving the Russians a perfect staging area to interdict any ground offensive by NATO if one occured and the Russians wished to join battle and 3) Blatantly poking a finger in NATO's eye in grand fashion. This single action had the effect of forcing NATO to pretty much abandon any thought of ground force intervention lest we purposely or accidently draw Russia into a ground conflict. While not stopping the war, Russia's act made it a major player and effectively dictated NATO's course of action in the Kosovo conflict.
In our campaign, however, the air campaign failed to force Yugoslavia'a surrender, they commenced ethnic cleansing of Kosovo, and NATO chose to initiate ground hostilities. The first step was a Special Operations task force being sent to Pristina to seize the airport from the Russian Airborne troops. The Russians screamed bloody murder and sent more troops to fight NATO while rallying the former Warsaw pact countries to their banner of anti-NATO/Slavic unity, including the three prospective NATO candidates. The Czech Republic and Russia send even more troops to protect Yugoslavia and Hungary forcibly ejects all NATO forces from its borders, resulting in NATO retaliation and the new "Belgrade Pact" responds in kind by preemptively attacking NATO assets in Germany, starting WWIII.
While this is dated compared to today's events, the setting was highly plausible five years ago, especially since there was a real possibility that things would have gotten ugly if events unfolded in any way similar to our campaign. A T2K campign based upon today's events would be even uglier because of the politics, alliances and rivalries of today are much more varied and fractured, resulting in many more regional wars, in addition to the classic East-vs-West conflict, that are unrelated to the main conflict yet affecting it none the less - in short, hell in a handbasket. Even more, such a campaign would actually be very believable considering the state of world affairs. Come to think of it, not a bad idea for a new T2K campaign....