Nobody ended any peace. The fight between Putin's Russia and NATO is purely on the ideological and economic level. It was the decision of NATO to escalate it.
Ukraine was neither part of EU nor NATO. The war has nothing to do with NATO other than them supporting the other side. Were the support for Syrian rebels or the bombing of Libya military attacks on Russia? No. NATO countries have invaded plenty of countries. People just have more sympathy with Ukrainians because they are not "brown people".