President Joe Biden on Saturday says North Korea has not responded to a US offer of Covid vaccines.
"We've offered vaccines, not only to North Korea but to China as well, and we're prepared to do that immediately," Mr Biden said in a joint appearance with South Korean President Yoon Suk-yeol.
"We've got no response," he added.
"The isolated regime of North Korea has previously turned down offers of vaccines from Covax, the global vaccine-sharing scheme, and from South Korea, as well as reportedly declining other offers."