Arbitration proceedings are usually characterized by greater freedom, informality and adoption of rules chosen by the parties. The rules of international arbitration institutions contain short, although comprehensive regulations, containing an average of 40 paragraphs of text. But what to do when war breaks into otherwise peaceful arbitration proceedings? The experience of war has been and has been spared our lawyers for approximately 80 years. But what should we do with international arbi-tration if we are an arbitrator in a dispute taking place in one of the belligerent states? The author will try to give some advice based on his own experience acquired since the outbreak of hostilities involving three of our neighbors: Belarus, Russia, and Ukraine.