attacked by nazi germany. meanwhile, russian forces have been pounding air fields and military bases all across the country. the british intelligence reporting at least 80 strikes since the fighting began. a u.s. source says russia has launched more than 160 missiles. heavy fighting reported in northeastern ukraine as well. video posted on twitter claims to show a military academy on fire. now cnn has witnessed heavy artillery fire in ukraine's second largest city, kharkiv. ukraine's president says at least 137 soldiers have been killed since this invasion began. and he believes the russians are coming after him. >> translator: according to our information, the enemy has marked me as target number one. my family is target number two. they want to destroy ukraine politically by destroying the head of state. we have information that enemy sabotage groups have entered