President Joe Biden came up well short on his goal of delivering 80 million doses of coronavirus vaccine to the rest of the world by the end of June as a host of logistical and regulatory hurdles slowed the pace of U.S. vaccine diplomacy. … It’s not for lack of doses. All the American shots are ready to ship, the White House said. Rather, it’s taking more time than anticipated to sort through a complex web of legal requirements, health codes, customs clearances, cold-storage chains, language barriers and delivery programs.