The FAA is granting an exemption that extends until June 30, 2020, the duration of medical certificates for certain pilots and flight engineers who conduct
scheduled and
on-demand operations outside the United States if those medical certificates expire between March 31, 2020, and May 31, 2020.
This is easy for the FAA to say, but if you are operating internationally it will be the CAA of the country that you are in when subjected to a ramp inspection who decide whether or not to allow you to proceed with an expired medical.
Not worth the risk.