After last week's talks between Russia, the United States, and NATO led to no apparent breakthroughs on European security, speculation has resumed in the West that Moscow is preparing an expanded invasion of Ukraine that could begin at any time. The Kremlin denies any plans to attack Ukraine, but policymakers in Kyiv and Washington say the Russian military's buildup near Ukraine's borders suggests otherwise. Some experts in the West, including several former senior U.S. military personnel, now argue that the Ukrainian Army might be able to withstand a Russian onslaught, if it receives all feasible support from NATO. Hoping that is purely a thought experiment, Meduza reviews some of the theories about how a larger war between Russia and Ukraine could unfold.