completes a russian-controlled land corridor between its mainland and russian controlled crimea. it also means russian access to the port city s key export hubs on the black sea, a major blow to ukraine whose remaining soldiers fight at all costs to protect the strategically important city. inside the steel plant, ukrainian forces singing a battle hymn. it s sweeter to die in battle than to live in chains as slaves they chant, prepared to fight for mariupol and ukraine until the bitter end. scott mclean cnn, lviv, ukraine. i want to bring in cnn military analyst and retired air force colonel cedric leighton, thank you once again for joining us. sources are saying tonight that the u.s. provided the intel that allowed ukrainian forces to target and sink the musculomeniscus coe va last month. is that information more deadly than giving ukraine more fighter jets? it can be, and let s go take