russian federation which range from the massing of 40,000 troops on the border to submersive activitiesn ukraine. >> these prorussian protestors seem to be standing ground here amid international concern over where the crisis is heading. >>> an underwater drone is used in the search for wreckage of the missing malaysian airliner in the indian ocean. australian officials say they're using a ping detector will stop and the submersible will be released as soon as possible. >> the flight for mh 370 is entering a new phase. for the first time the submersible will scour the ocean floor. the submersible will be operating at limit of capabilities and in a remote area new to man according to the head of the australian recovery mission. it will be a slow and measured process. the experts have therefore determined that the estranged vessel ocean shield will cease searching with the ping locater later today and deploy the autonomous underwater vehicle bluefin-21 as soon as possible. >> the deep sea sub, bluefin-21 is replacing the ping locater, a sophisticated listening device that detected four signals con