Call of Duty: Modern Warfare 3\n\n Makarov is heard saying his infamous line "Remember, no Russian." Yuri exits the elevator and picks up a dead guard's P99 and attempts to stop Makarov and the others, but falls over and becomes unconscious due to severe blood loss.
No Russian refers to Makarov's insistence that no one on his team reveals their nationality; people need to believe Russia was attacked by Americans, not a cell of its own people.
First thing, compare the network speed and statistics on your console as well as on speedtest using a laptop or mobile device. On your Xbox: Settings > General > Network Settings > Test Network Speed and Statistics. If it's the same and indeed high ping on both, the issue can be with your network connection.