If you're talking about Iraq, I tend to agree with you. Saddam was a threat, but not an immediate one. This is different. Kim is flaunting his illegal nuclear program, and working on a delivery system that will be a worldwide threat. It's only a matter of time before he perfects 1950's technology. Big difference between alleged chemical weapons and proven nukes.

Russia has sanctions, but I can't think of an example of where they have been breached. At least not using direct threat of war.