MOSCOW — RECENT events surrounding Syria have prompted me to speak directly to the American people and their political leaders. It is important to do so at a time of insufficient communication between our societies. Relations between us have passed through different stages. We stood against each other during the cold war. But we were also allies once, and defeated the Nazis together. The universal international organization — the United Nations — was then established to prevent such devastation from ever happening again. The United Nations’ founders understood that decisions affecting war and peace should happen only by consensus, and...