ALMATY—Security forces appeared to have reclaimed the streets of Kazakhstan’s main city on Friday after days of violence, and the Russian-backed president said he had ordered his troops to shoot to kill to put down a countrywide uprising. A day after Moscow sent paratroopers to help crush the insurrection, police were patrolling the debris-strewn streets of Almaty, although some gunfire could still be heard. Dozens have died and public buildings across Kazakhstan have been ransacked and torched in the worst violence the former Soviet republic has experienced in 30 years of independence. Moscow said more than 70 planes were ferrying Russian troops into Kazakhstan, and that these were now helping control Almaty’s main airport, recaptured on Thursday from protesters. The uprising has prompted a military intervention by Moscow at a time of high tension in East-West relations as Russia and the United States gear up for talks next week on …