Roman Korsak, a Ukrainian grocery store owner with four years of experience operating during wartime, is advising citizens to hold some cash. He explains that complete reliance on digital payments is risky due to potential power outages and disruptions to infrastructure caused by ongoing conflict with Russia. Korsak highlights past instances where electronic systems failed, leaving customers unable to purchase essential goods. Maintaining a small amount of cash, he argues, provides a safety net for basic necessities. He emphasizes this is a practical measure for personal preparedness, given the unpredictable nature of the war in Ukraine. The advice comes as Ukraine continues to face challenges maintaining economic stability amidst the invasion.