MOSCOW (AP) – Thousands of doctors, teachers and others in high-risk groups have signed up for a COVID-19 vaccination in Moscow starting Saturday, a precursor to a Russia-wide immunization effort. The vaccination effort comes three days after President Vladimir Putin ordered the launch of a “large-scale” COVID-19 immunization campaign even though a Russian-designed vaccine has yet to complete the advanced studies needed to ensure its effectiveness and safety in line with established scientific protocols. The Russian leader said Wednesday that more than 2 million doses of the Sputnik V jab will be available in the next few days, allowing authorities to offer jabs to medical workers and teachers across the country starting late next week.