A "rogue nation" is "a nation or state regarded as breaking international law and posing a threat to the security of other nations." Wikipedia has a good background on the term. Given the criteria of "being ruled by authoritarian governments that severely restrict human rights, sponsoring terrorism and seeking to proliferate weapons of mass destruction", isn't Vladimir Putin's Russia the biggest rogue State out there?

Consider: The invasion and annexation of Crimea; the assassination of dissidents (Ex-Spy Sergei Skripal Is Just the Latest Russian Dissident to Meet Tragedy on British Soil - TIME); fomenting rebellion in neighbouring States; aggressively undermining elections in Europe and the United States; threatening nuclear war. Who is the greater threat to the international order, Kim Jong Un or Vladimir Putin?
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Here, as elsewhere, people are outraged at what feels like a rigged game -- an economy that won't respond, a democracy that won't listen, and a financial sector that holds all the cards. - Robert Reich