Surely the gamblers in the war-affected countries will suffer to some extent because lots of services are already affected, some citizens will consider going out of the country if they have the means while others will remain and try to flow with the situation and face realities. Online gambling becomes the best and only option at this time.
I don't believe anyone in the affected country will have that mind to think of playing gambling at this time because I don't think there still internet service in some of the affected city in Ukraine though I stand to be corrected anyway.