A veteran Russian diplomat to the United Nations Office in Geneva on Monday said he had handed in his resignation before sending out a scathing letter to foreign colleagues inveighing against the “aggressive war unleashed” by Russian President Vladimir Putin in Ukraine. Boris Bondarev, 41, confirmed his resignation in a letter posted on his Facebook page. "For twenty years of my diplomatic career I have seen different turns of our foreign policy, but never have I been so ashamed of my country as on February 24 of this year," he wrote, alluding to the date of Russia’s invasion of Ukraine. Bondarev - a diplomatic counsellor who has focused on Russia’s role in the Conference on Disarmament in Geneva after postings in places like Cambodia and Mongolia - confirmed in a phone call with The Associated Press that he had handed in his resignation in a letter addressed to Ambassador Gennady Gatilov. A spokesperson for the mission didn't immediately respond to AP requests seeking comment. The resignation amounts to a rare - if not unprecedented - public admission of disgruntlement about Russia’s war in Ukraine among the Russian diplomatic corps. It came at a time when the government of President Vladimir Putin has sought to crack down on dissent over the invasion and quell narratives that conflict with its line about how the “special military operation” - as it’s officially known in Russia - is proceeding. Subscribe to our YouTube channel: https://bit.ly/2TwO8Gm Subscribe to our newest channel Quicktake Explained: https://bit.ly/3iERrup Bloomberg Quicktake brings you live global news and original shows spanning business, technology, politics and culture. Make sense of the stories changing your business and your world. To watch complete coverage on Bloomberg Quicktake 24/7, visit http://www.bloomberg.com/qt/live, or watch on Apple TV, Roku, Samsung Smart TV, Fire TV and Android TV on the Bloomberg app. Have a story to tell? Fill out this survey for a chance to have it featured on Bloomberg Quicktake: https://cor.us/surveys/27AF30 Connect with us on… YouTube: https://www.youtube.com/user/Bloomberg Breaking News on YouTube: https://www.youtube.com/c/BloombergQuickTakeNews Twitter: https://twitter.com/quicktake Facebook: https://www.facebook.com/quicktake Instagram: https://www.instagram.com/quicktake