North Korean leader Kim Jong-un arrived in Russia by private train to the strains of a military band on Tuesday for talks with president Vladimir Putin - amid warnings from Washington they should not trade weapons. Kim left Pyongyang for Russia on Sunday on board his train the North's state media reported on Tuesday, accompanied by top arms industry and military officials. A Russian source said Kim had arrived on Tuesday morning, leaving his train to meet Russian officials in Khasan, the rail gateway to Russia's far east,...