After two Russian military planes landed near Caracas this month, the Trump administration issued stark warnings over President Nicolás Maduro’s ties to the Kremlin. But a vessel that arrived in the waters off Venezuela’s Caribbean coast a day earlier offered a more telling sign of a deepening relationship that is so alarming to Washington. Venezuela has the world’s largest known oil reserves, with transport and sales of its thick, sludgy crude long dependent on chemical thinners purchased from the United States. After Washington barred U.S. companies from selling them to Venezuela in January — and warned foreign companies to follow suit — Maduro faced a dire predicament: How would he stave off the […]