By Hilary Russ and Uday Sampath Kumar NEW YORK (Reuters) -McDonald’s, PepsiCo, Coca-Cola and Starbucks stopped sales of their best-known products in Russia on Tuesday, offering a united rebuke of the war on Ukraine by companies that define America for much of the world. Pepsi and McDonald’s were corporate pioneers whose work with the Soviet Union and the post-Soviet Russian state decades ago were seen as improving international relations. All four companies have major operations in Russia. McDonald’s said it would go on paying salaries to its 62,000 employees in Russia as it closed 847 restaur…