here. was it some sort of mechanical problem? pilot error? if the united states can't be involved in this yet china goes on the offensive against boeing airlines and their technical specifications, that can already complicate a troubled relationship between the u.s. and china. >> absolutely. this is a very significant issue in that regard. thank you. >>> thanks to all of you. "a.c. 360" starts now. >>> good evening and consider this. we still don't know tonight who is leading russia's war on ukraine. in fact, multiple sources tell cnn the u.s. has not been able to determine if russia designated a military commander for the job. in other words, no norman schwarzkopf or tommy franks. no name to put to the bloodiest conflict in europe since the second world war. also we don't know number of russian casualties, which russia's defense ministry hasn't updated in more than two weeks. however, today a horrifying hint. a russian tabloid published a