Under that agreement, Ukraine surrendered the world’s third‑largest stockpile of Soviet‑era nuclear weapons in exchange for security assurances from the US, the UK and Russia, a point that remains central to Ukrainian debates over long‑term security guarantees. The Duke of Sussex told Russian President Vladimir Putin there was “still a moment now to stop this war,” and said the United States had a “singular” or “exceptional” role in upholding Ukraine’s sovereignty because of those commitments. Asked about the remarks in the Oval Office, President Donald Trump said Harry was “not speaking for the UK,” according to reporters present. The exchange came days before King Charles III’s US visit is due to begin on April 27.