stop people from entering the land of the united states. one thing i can tell you is these border patrol agents we worked with they are very professional, very considerate, they are ambassadors to this country and they do a great job being ambassadors to these people who ve gone through an awful lot. this is gary tuchman, cnn, in el paso, texas. the u.s. and russia are pointing fingers at one another after two of their warships almost collided in the pacific. each side is accusing the other of making reckless maneuvers. as cnn s alex marquardt reports, it comes as military tensions between the two nations have been escalating. reporter: a brazen challenge. this russian destroyer according to the u.s. navy coming within 100 feet of the uss chancellorsville. the american sailors recording the latest potentially deadly provocation by the russian military. the incident taking place in international waters in the philippine sea just south of the japanese island of okinawa. the russian
other. the u.s. navy is saying photographic evidence proves it was the russians who were at fault. reporter: a brazen challenge. this russian destroyer according to the u.s. navy coming within 100 feet of the uss chancellorsville, american sailors recording the potentially deadly provocation but the russian military. taking place in the philippine sea south of okinawa. the russian action came as the u.s. cruiser was trying to land a helicopter on its deck, giving it even less maneuverability than usual. you have to be on a set course and set speed so that the winds across the deck are safe for the helicopter to land. reporter: boxed in the captain performs an emergency maneuver called an all engines back full. you re basically throwing that ship into reverse while it s moving forward at 15 to 18 miles an hour would be my guess. it s 10,000 tons of metal moving through the water. it s not going to stop quickly.