It was a throwaway quip but Wikipedia says:
a proxy war is an armed conflict where at least one of the belligerents is directed or supported by an external third-party power
So the Ukraine war fits squarely in that definition. Other examples I found cited online were Korea, Vietnam, and the Soviets in Afghanistan - all of which have a major power as one of the direct belligerents
It looks like there is a cut over built into the curb that you can see in the picture right above the head of the person in the blue shirt