America; FDA standards initially allowed low-quality KN95 masks from China:

The shortage of personal protective equipment (PPE) at the beginning of the coronavirus outbreak in the United States led public health officials to hold off on recommending that most Americans use face masks. But the Food and Drug Administration’s (FDA) response allowed low-quality masks from China into the country, according to a Wall Street Journal (WSJ) analysis, and created confusion.

Read more: https://thehill.com/changing-america/well-being/prevention-cures/510334-fda-standards-initially-allowed-low-quality-kn95