that declaration, the latest pierce of an overarching effort by biden to present a unified and reinvigorated alliance of western democracies, one that will be challenged in a matter of days as biden sits down with russian president vladimir putin and his wife jill telling reporters he's up for the challenge. >> oh my gosh, he's overprepared. >> reporter: the days ahead, a calibrated effort to lead the post world war ii western alliances to meet the challenges of a new era. >> america will be the arsenal of vaccines in our fight against covid-19, just as america was the arsenal of democracy during world war ii. >> reporter: with a new vaccine effort at the center of that push. biden announcing the purchase of 500 million doses of the pfizer vaccine to be donated to 92 lower middle income countries in the african union. >> america will be the arsenal of vaccines in our fight against