A Russian flag flies near Pro-Russia militants sitting atop a 2S1 Gvozdika (122-mm self-propelled howitzer) as a convoy of pro-Russian forces takes a break as they move from the frontline near the eastern Ukrainian city of Starobeshevo in Donetsk region, on February 25, 2015. France, Germany, Russia and Ukraine called on February 24 for a total ceasefire in eastern Ukraine as London announced it was sending troops to train government forces fighting pro-Russian separatists in eastern Ukraine.
(VASILY MAXIMOV/AFP/Getty Images)
Air superiority would be crucial to any Western response if Russia should invade Ukraine....
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