LONDON (Reuters) - Russia and Ukraine should negotiate an end to their conflict to avoid the war spilling over into Belarus, President Alexander Lukashenko, a key ally of Vladimir Putin, said in an interview with Russian state television. Lukashenko was speaking against the backdrop of a Ukrainian incursion into Russia that began on Aug. 6 when thousands of Kyiv's troops smashed through Russia's western border in a major embarrassment for Putin's top military brass. In a wide-ranging interview, Lukashenko said that only "high-ranking people of American origin" wanted the Ukraine-Russia war to continue. The West, he said, was encouraging Kyiv...