Picture on left....
Blue and Yellow Flag of Ukraine
Red and white diagonal is the flag of Afghanistan
Lower “flag” holding a cross with stylized image of skull...United States?
Sorry, you're wrong. That's not a flag of Ukraine.
The Ukrainian flag is blue and yellow which represents a blue sky and yellow wheat fields.
In that painting the yellow is on top and blue on the bottom.
It is obvious the artist has just mastered painting between the lines with primary colors.