The US said it was concerned about Russian President Vladimir Putin’s threat to supply North Korea with weapons, warning it would “destabilize” the Korean peninsula. Depending on the type of weapons provided, such a move may violate UN Security Council resolutions which Russia itself supported, US State Department spokesman Matthew Miller said on Thursday. The US would continue to work with its allies in the region, including South Korea and Japan, to “respond to the threat posed by North Korea,” he said. During a state visit to Pyongyang on Wednesday, Putin signed a partnership agreement with…