U.S. authorities claim to be one step closer to proving a seized $300 million mega yacht is owned by sanctioned Russian Suleiman Kerimov, according to new court filings that detail alleged payments for the boat from the oligarch’s niece.

The yacht, a 348-foot luxury vessel known as Amadea, was seized in Fiji in 2022 by local officials at the request of the United States, as part of the Justice Department’s ongoing efforts to identify and seize assets of sanctioned Russian oligarchs in the wake of Russia’s 2022 invasion of Ukraine.

Kerimov, known for throwing lavish parties and for his reportedly close relationship with Vladimir Putin, was sanctioned by the U.S. in 2018. Britain and the European Union later followed suit.

However, since the Amadea’s seizure, another Russian oligarch, Eduard Khudainatov, who is not currently under U.S. sanctions, has claimed to be the yacht’s rightful owner — an assertion U.S. authorities deny.

Prosecutors allege that new documents show Kerimov’s niece, Alisa Gadzhieva, entered into a loan agreement with the company that owns the yacht, Errigal Marine Limited, and then made two payments to Khudainatov’s holding company, Invest International Finance Ltd, Intelligence Online reported.

“The United States takes sanction evasion seriously and will use all tools at its disposal to ensure that sanctioned individuals are held accountable for their crimes,” U.S. Attorney for the Southern District of New York Damian Williams said in an earlier statement

The ship belongs to an array of high-value luxury items linked to Kerimov, including private jets and sportscars, like a $650,000 Ferrari that Kerimov totaled in a fiery crash on the French Riviera in 2006. 

The yacht’s seizure followed ICIJ’s Pandora Papers, which included revelations on the offshore financial empire of Kerimov and his closest associates. The investigation showed billions of dollars flowing through opaque offshore shell companies associated with Kerimov, and covert money flows tied to oligarchs and others close to the Kremlin. It also highlighted offshore professionals who have helped oligarchs secretly buy luxury assets like yachts and jets.

Gadzhieva’s brother, Kerimov’s nephew Nariman Gadzhiev, is also under U.S. sanctions for allegedly serving as an assistant and financial facilitator for Kerimov. ICIJ’s reporting showed that, in 2012, a firm registered in Gadzhiev’s name worked with Credit Suisse to secure a $67 million loan for the acquisition of a custom-built Boeing 737 Business Jet as well as a Bombardier Global Express jet. A few years later, an article in Forbes Russia described Kerimov as owning the same kind of Boeing jet.

The Amadea, which is currently in U.S. custody, has already cost over $7 million in taxpayer funds to maintain while the legal battle plays out, The Guardian reported.