For months, by Zoom calls and then by jet, Indonesian ministers and officials scoured the world for access to a vaccine for the coronavirus that Southeast Asia¡¯s biggest country is struggling to control. This month, their campaign paid off.

Three Chinese companies committed 250 million doses of vaccines to the archipelago of 270 million people. A letter of intent was signed with a U.K.-based company for another 100 million.

Absent from these pledges: the United States.