For years, North Korea has been under a sprawling, complex network of U.N. sanctions over its banned nuclear and ballistic missile weapons programs, with violations carefully tracked and monitored by experts.
But with one veto, Russia has put a stop to much of this work — not lifting the sanctions but ending the U.N.'s monitoring, a major win for North Korea's Kim Jong Un, according to experts.
Here's a look at what we know:
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