Ukraine is mostly cloudy this time of year. Satellite imagery can sometimes see people sized objects, especially if they are body temperature and radiating infrared, but that requires no clouds. With so much propaganda going on, claims of satellite images of cold dead bodies is highly suspect. It would be much more believable if these images came from aerial surveys, and the full gigabyte sized photos were released quickly, un-photoshopped.
Weather Satellite Images: Kyiv City