<b>Live updates: follow the latest news on </b><a href="https://www.thenationalnews.com/world/2022/02/18/russia-ukraine-latest-news/"><b>Russia-Ukraine</b></a> Authorities in Hamburg impounded Russian billionaire <a href="https://www.thenationalnews.com/world/uk-news/2022/03/30/alisher-usmanovs-600000-bulletproof-car-seized-in-sardinia-as-part-of-eu-sanctions/" target="_blank">Alisher Usmanov</a>’s superyacht <i>Dilbar </i>after determining it was legally owned by his sister, who is also subject to western <a href="https://www.thenationalnews.com/world/uk-news/2022/04/13/uk-imposes-sanctions-on-russian-supporters-of-separatist-states-in-ukraine/" target="_blank">sanctions</a> over the <a href="https://www.thenationalnews.com/opinion/comment/2022/04/10/what-russians-want-from-the-ukraine-war/" target="_blank">war in Ukraine</a>. The 156-metre vessel, the world’s largest by volume, had been undergoing refitting in the northern German port city. With a 25-metre swimming pool and two helipads, it is valued at between $600 million and $750m, the US Treasury says. Germany’s federal crime office the BKA said on Wednesday that despite efforts at “offshore concealment", it had determined that the yacht’s owner was <a href="https://www.thenationalnews.com/world/uk-news/2022/03/03/uks-liz-truss-says-sanctions-against-russian-billionaire-send-clear-message/" target="_blank">Mr Usmanov</a>’s sister, Gulbakhor Ismailova. “The luxury yacht <i>Dilbar </i>is therefore subject to sanctions law and was able to be legally impounded in Hamburg,” the BKA tweeted. The yacht could not be “sold, rented or pledged as collateral", a BKA spokesman told DPA news agency. The move underscores the wider effects of the penalties levied by Europe and the US on ultra-rich Russians considered to have close ties to President <a href="https://www.thenationalnews.com/world/uk-news/2022/04/06/who-are-the-latest-oligarchs-sanctioned-by-uk-government/" target="_blank">Vladimir Putin</a>. Superyachts and other luxury possessions of Russia’s elite have drawn especially intense scrutiny since the country’s invasion of Ukraine. Mr Usmanov owns a major stake in USM, a Russian investment group with holdings in Metalloinvest, one of the world’s largest iron ore producers, and telecommunications company MegaFon. He is the sixth-richest Russian, with a fortune of $19 billion, the Bloomberg Billionaires Index shows. The yacht is named after his mother.