It’s enough to make an aging U.S. Cold Warrior shudder.

During overlapping visits to Latin America, the leaders of China and Russia have been welcomed with open arms by governments that are among the most hostile to Washington, including Cuba, Nicaragua and Venezuela. Together with stops in Argentina and Brazil, which both have distanced themselves from the U.S. in recent years, the tours underscore the mix of ideology and economics that’s allowing the two superpowers to expand their influence in America’s backyard.