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Which has pleaded for more warplanes after suffering heavy losses since the russian invasion began. ukrainian pilots would be able to fly the polish migs with minimal training but u.s. defense officials fear a transfer of fighter jets from a nato country to ukraine could risk a direct conflict between russia and nato. there's one letter which has emerged as a symbol of russia's war against ukraine. that's the letter "z," which doesn't actually exist in the russian alphabet. but it's been seen on russian tanks, painted on military vehicles. cnn's phil blake reports on how it's being used to s...

But we failed to stop them. >> reporter: you haven't failed because you're here. you're speaking. >> really powerful interview there. a new pro-war symbol has emerged, a sign of division between those who believe russia is right to invade and everyone else who sees it as pure aggression. cnn's phil black has the story. >> reporter: it's impossible not to notice many of the russian vehicles invading ukraine carry a distinctive mark, trucks, tanks, fighting engineering and logistical vehicles, they are advancing through ukraine with the letter "z" painted conspicuously in white. the people being...