Through the most tense encounters with President Vladimir V. Putin’s Russia over the past decade, there has been one project in which Washington and Moscow have claimed common cause: keeping North Korea from expanding its arsenal of nuclear weapons. Now this is no longer true. On Thursday, Russia used its veto power in the United Nations Security Council to kill off a U.N. panel of experts that has been monitoring North Korea’s efforts to evade sanctions over its nuclear program for the past 15 years. The panel has provided vivid evidence of how Russia is keeping the North brimming with fuel and other goods, presumably in return for the artillery shells and missiles that the North Korean leader, Kim Jong-un, is shipping to Russia for use against Ukraine.

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