Covid-19__USA is seeking doses everywhere like a junkie

First USA tried to allure CureVac AG afterward they tried to hoard medical supplies and now they are buying doses in all possible vaccine suppliers. See image below taken from the last edition of The Economist. But strangely Trump is not buying the vaccine of his Russian best friend. What does that mean ?  https://www.nature.com/articles/d41586-020-02386-2

PS - Does is make any sense that USA and EU have ordered twice as many doses as were ordered by dozens of COVAX countries?