The Joe Biden administration says the restrictions are directed at protecting national security, not stifling economic competition.

Several countries stand out for their success in delivering coronavirus vaccinations, while most of the world is struggling to figure out how to get immunizations into more arms.

The virus appears to be less dangerous than SARS, but there are still concerns of a wider outbreak in Asia.

The coronavirus has cut into few industries more deeply than aviation and aerospace, putting some strategically important companies in dire financial straits.