The phrase "rogue government" refers to a government or governing body that operates in a reckless, unpredictable, or unlawful manner, often disregarding the rights and well-being of its citizens or the international community. Full definition
In some cases, though, they seem to be working hand in glove with rogue governments like China. (slaw.ca)
«The Syrian situation poses two conflicting goals: to allow the use of chemical weapons by the Syrian government to go unanswered would encourage the Assad regime, and other rogue governments, to use them again, but the last thing America needs or wants is a protracted conflict in the Middle East when our primary focus must be on jobs, the economy and the middle class. (nystateofpolitics.com)