Start with registration: ask for a company extract and confirm it with the local chamber of commerce. Then call customers yourself, not through the distributor, ideally ones served for two years or more. Put payment method, delivery, warranty handling and dispute resolution in writing, reviewed by a lawyer who knows Ukrainian commercial law. Our page on distributor vetting goes through the process. https://medium.com/@foxxfifin/market-analysis-for-ukraine-rebuild-a-practical-starting-point-23ac8e1cea9b