Biden arrived on board the presidential plane at Mildenhall Air Force Base and is due to speak to members of the US Air Force in the evening MILDENHALL, England: President Joe Biden will announce a major new initiative to vaccinate the world against Covid-19 ahead of a G7 summit, showcasing his brand of US leadership before going into a difficult meeting with Russia"s Vladimir Putin next week. Biden landed in England on Wednesday for the start of his first foreign trip as president - which features the G7 meeting, summits with NATO and the European Union in Brussels, and finally talks with Putin in Geneva. On the way, Biden"s national security advisor, Jake Sullivan, told reporters aboard Air Force One that the president would kick things off with news of a major vaccine sharing initiative. Sullivan would not give full details, but according to US media reports, the Biden administration is set to buy 500 million doses of the Pfizer/BioNTech vaccine for international distribution. Doses will be aimed at developing countries, Sullivan said. "The president is focused on helping to lead the world because he believes it"s the right thing to, it"s what Americans do in times of need," he said. "We were the arsenal of democracy in World War II. We"re going to be the arsenal of vaccines." The Group of Seven will make a further joint declaration on "a comprehensive plan to help end this pandemic as rapidly as possible," Sullivan said. The 78-year-old president was headed first to the G7 gathering in a Cornish seaside resort from Friday to Sunday, alongside the leaders of Britain, Canada, France, Germany, Italy and Japan. From there, in rapid succession, he will visit Queen Elizabeth II at Windsor Castle and fly to Brussels for summits with the NATO military alliance on Monday and the European Union on Tuesday. He will finish in Geneva to meet Putin next Wednesday, holding talks in an elegant villa overlooking Lake Geneva, a US official who asked not to be named told AFP. With the world still crawling out from under the wreckage of Covid-19, Biden has cast his diplomatic marathon as a return to badly needed US leadership. Boarding Air Force One outside Washington earlier Wednesday, Biden said his trip would make "clear to Putin and China that Europe and the United States are tight." Biden"s pitch marks a return to traditional US diplomacy after four years during which Donald Trump flirted with autocrats and recast multilateralism as a dirty word.