Cesium does not render content for Ukraine

1. A concise explanation of the problem you're experiencing.

When I'm visiting site with cesium rendered content I see black screen and following failed request:

When I'm visiting same site with USA vpn ( originally it's Ukraine ) same request have status 200 and content is shown:

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

I need this for testing purposes.

4. The Cesium version you're using, your operating system and browser.

Cesium - 1.58.1
OS - macos 10.14.5
Browser - 75.0.3770.90

This is a known issue, please see Matt’s response here: https://github.com/AnalyticalGraphicsInc/cesium-ion-community/issues/31