North Korean leader Kim Jong Un appeared in public wearing a mask for the first time a year after the country claimed it did not have a single case of COVID-19. While the rest of world initiated mass vaccination campaigns, the isolated nation sealed its borders and refused to accept a single dose. As Kim declares nationwide lockdowns, the official line is that one person has died of the virus in North Korea. CBS News' Elizabeth Palmer has more. "CBS Weekend News" and "CBS Evening News with Norah O'Donnell" deliver the latest news and original reporting, and goes beyond the headlines with context and depth. Catch the "CBS Evening News" every weekday night at 6:30 p.m. ET on the CBS Television Network and at 10 p.m. ET on the CBS News app. Subscribe to the "CBS Evening News" YouTube channel: https://bit.ly/1S7Dhik Watch full episodes of "CBS Evening News": https://cbsn.ws/23XekKA Follow "CBS Evening News" on Instagram: https://bit.ly/1T8icTO Like "CBS Evening News" on Facebook: https://on.fb.me/1KxYobb Follow "CBS Evening News" on Twitter: https://bit.ly/1O3dTTe Download the CBS News app: https://cbsn.ws/1Xb1WC8 Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: [email protected]