Ukrainians wearing face masks sit on a public bus in Kyiv, Ukraine, Tuesday, March 17, 2020. Ukrainian authorities ruled to close public places except food markets, pharmacies and gas stations starting from Tuesday in Kyiv and other regions, and restrict the use of public transport from Kyiv to other Ukrainian cities. For most people, the new coronavirus causes only mild or moderate symptoms. For some it can cause more severe illness, especially in older adults and people with existing health problems. (AP Photo/Efrem Lukatsky)