ukraine's third largest city, odesa is on edge. russian troops have had control of crimea in parts of the donbas region but now they're moving in on other cities along the black sea. nick paton walsh is on the black sea where some are taking up arms to fight back. >> reporter: slowly, moscow's tentacles are strangling the black sea coast. these russian troops helping themselves to the stores of the town of kherson, leading this man away, according to a resident who spoke to cnn. and also showing here, too. the disregard for life, leaving