The 79-year-old, who has sparked controversy before this with his stance on the war, was invited by Moscow to address the 15-member Council. US deputy ambassador Richard Mills said of Waters: "While I certainly acknowledge his impressive credentials as a recording artist, his qualifications to speak to us as an expert briefer on arms control or European security issues, are less evident to me. Waters responded by posting a statement on Twitter that said he "refutes entirely" Samson's accusation