nuclear threats. elise labott, cnn. >>> foreign minister and secretary of state john kerry have talked on the phone about the crisis in ukraine. officials released a statement saying sergei lavrov stressed the need for the the military to cease operations against the pro-russian separatists in the eastern part of the country. those groups have seized land and government buildings and they refuse to leave. meanwhile ukraine's prime minister says russian military aircraft crossed into and violated ukrainian airspace last night. russia has denied violating the airspace. >>> back in this country, the nra finds itself in a dogfight this year. it's being challenged by a new antigun lobby backed by billionaire michael bloomberg. but the nra and about 70,000 supporters meeting in indianapolis this weekend aren't flinching. executive director pierre says the organization faces a do or die challenge. >> we trust in our freedom, and