Stifled by hurdles, President Joe Biden trailed his goal of delivering 80 million doses of Covid-19 vaccine to the rest of the world by June end.

The US has shipped fewer than 24 million doses to 10 recipient countries.

The White House says more will be sent in the coming days and stresses that Biden has done everything in his power to meet the commitment.

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. Complicating matters even further is that no two shipments are alike.

One country requires an act of its Cabinet to approve the vaccine donation, others require inspectors to conduct their own safety checks on the US doses, and still others have yet to develop critical aspects of their vaccine distribution plans to ensure the doses can reach people’s arms before they spoil.

A US official, speaking on condition of anonymity to share internal arrangements, said that as of Wednesday, all intended recipient countries had received formal US offers of a specific number and type of vaccine, and all legal and logistical hurdles on the US side had been cleared.

The White House declined to specify which nations were grappling with which local hurdles, saying it is working with recipient nations on an individual basis to remove obstacles to delivery.

Biden announced the 80 million target on 17 May, saying, “This will be more vaccines than any country has actually shared to date – five times more than any other country – more than Russia and China.”

The 80 million doses are meant as a down payment on a far larger plan to purchase and donate 500 million vaccine doses for the world over the next year. That plan, relying on a purchase contract from Pfizer that will begin delivering doses in August, remains on track, officials said.

Last week the White House broadly outlined its plans for all 80 million doses, but it is not publicly releasing a list of how many and of what type of vaccines each recipient will get until the doses are on the way.

The US recipients to date are Colombia (2.5 million Johnson & Johnson doses), Bangladesh (2.5 million Moderna), Peru (2 million Pfizer), Pakistan (2.5 million Moderna), Honduras (1.5 million Moderna), Brazil (3 million J&J), South Korea (1 million J&J), Taiwan (2.5 million Moderna), Canada (1 million Moderna, 1.5 million AstraZeneca) and Mexico (1.35 million J&J, 2.5 million AstraZeneca). All told, it’s enough vaccine to fully protect 15.9 million people.