People like treaties because they sound all noble. The US made hundreds of treaties with our native American tribes, then systematically broke every last one of them. We signed on to noble sounding ideas like the Kellogg-Briand Pact that actually outlawed war. That became effective in 1929, just 10 years before the outbreak of WWII. Then there was the Munich Pact that gave away Czechoslovakia to appease Hitler (the Czechs weren't invited to participate in the negotiations, just to surrender). That was signed on Sept 28, 1938, almost exactly 11 months before Hitler invaded Poland (Sept 1, 1939). Before he did that, he signed a Non-Aggression Pact with the Soviet Union, only to invade them in 1941.

Treaties are all well and good, I suppose. It gives employment to a bunch of diplomats who have no other marketable skills. Just don't confuse treaties with reality or with peace. They're just more pieces of paper that are useful until they become inconvienent.