Transcripts for CNN Wolf 20140407 17:26:00

has been concerned about for some time now. people crossing the border from russia into ukraine with the intention of causing trouble, creating the sort of instability that could give russia the pretext to take further action. ukrainian government has said they've stopped around 10,000 people from entering the country because they believe russians were heading in there to cause trouble. russia's blanket statement is it is not responsible for the instability in ukraine. this is the fault of the new government in kiev and the fact they're not looking to respect everyone's rights and everyone's concerns, particularly the russian-speaking people and the east and the south of the country, wolf. >> escalating tensions between ukraine and russia. very serious development. phil black in russia for us. thanks very much. in a moment, we'll get back ton the search for malaysia flight 370. we're going to find out how american technology has now played a key role in what could be, could be, a huge breakthrough in the search for