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It was a little bit on the nose. On a trip to Kyiv, Secretary of State Antony Blinken swapped his suit for a more casual button-down and appeared, a guitar slung over his shoulder, at the front of a stage in a bar in the Ukrainian capital. There — before a crowd of locals, U.S. diplomats and the traveling press pack that accompanies him on his official trips — Blinken performed a rendition of the 1989 song “Keep on Rockin’ in the Free World” by Canadian American musician Neil Young.