BANGUI, Central African Republic — The dealer pulled back a shiny pink curtain and sprinkled the contents of two white envelopes across his desk: sparkling diamonds, more than 100 of them. Some gems are sold legally, he explained. But many are trafficked by rebels who fight over the mines, adding fuel to a six-year uprising… Read More Gems, Warlords and Mercenaries: Russia’s Playbook in Central African Republic