This paper argues that modern international conflicts, like the 2026 tensions between the United States, Israel, and Iran, are more complex and unpredictable than traditional wars because they involve many actors, indirect confrontations, and overlapping forms of pressure. It suggests that global stability depends not just on military power or formal rules, but on shared understandings and informal norms that help countries recognize limits, avoid misunderstandings, and show restraint during crises. Using examples such as the Cuban Missile Crisis and the opera Cavalleria Rusticana, the paper explains that even without strong enforcement, communication, trust, and unwritten rules can help prevent conflicts from escalating out of control, especially in today’s more fragmented and uncertain multipolar world.