Here are the core questions emerging from the case:

Why were Diegelmann and his companies sanctioned by OFAC?

The court documents offer very limited information. OFAC’s key piece of evidence appears to be its press release, which accuses the «Diegelmann Illicit Finance Network» of having «collaborated with Russia-based metals companies to disguise the origin of Russian precious metals», having «assisted Russian clients to launder funds by buying and selling precious metals for cash, illicitly circumventing international sanctions» and having taken «steps to obfuscate the ownership of Russian clients and the beneficiaries of these transactions».

However, there is no clear evidence of these activities in the public court records. More detailed accusations may be contained in the unredacted administrative record, which only the judge has seen. Rheingold Edelmetall and Diegelmann speculate in their filings that a December 2023 meeting in Moscow, where they discussed building a precious metals vault in Oman with a potential Russian partner, Highland Gold, may have triggered the sanctions. They claim, however, that the Russian partner was only sanctioned by OFAC in December 2023, after which they severed ties. They argue that no steps were taken to implement the project.

What do «operating in the Russian mining and metals industry» and «act of procuring» mean, legally?

A linguistic and legal debate is central to this case, focused on the interpretation of these terms. Under an executive order by President Joseph R. Biden, individuals can be sanctioned for «operating or having operated» in certain Russian economic sectors designated by OFAC, including any «act of procuring.» OFAC has classified the Russian mining sector as critical.

The parties have presented differing interpretations of these terms to the court. OFAC contends that even purchasing gold from Russia before the sanctions took effect in spring 2022 constitutes participation in the Russian precious metals sector. Moreover, any acquisition of metals from a Russian entity qualifies as «procuring» under the sanctions regime. The plaintiffs, however, argue they never conducted business with any sanctioned individuals and, since Russia invaded Ukraine, have not purchased gold from Russia.

According to them, there is nothing that legally suggests «that precious metals refined and mined outside of Russia become ‹Russian› simply because they are owned or purchased by a Russian national. Put another way, a U.S. dollar does not become a ruble when owned by a Russian.»

Why did OFAC change its legal focus mid-case?

One of the interesting developments in this lawsuit has been OFAC’s shift in strategy. Initially, the Treasury and OFAC described the «Diegelmann Illicit Finance Network» as a group that concealed the Russian origin of metals and facilitated cash transactions for Russian clients, enabling money laundering. However, these claims have not been substantiated in court. Instead, the agencies are rather focusing on a broad interpretation of legal terms that would allow them to sanction anyone who has ever purchased gold in Russia or facilitated a precious metals transaction for a Russian national.

OFAC acknowledges in its filings that «Plaintiffs’ transactions did not render them automatically placed on the SDN List» and that the agency «made the discretionary decision to designate Plaintiffs for their sanctionable transactions.» This means that the agency is relying on its discretionary powers to justify the sanctions. This shift has led to questions about the broad discretion OFAC exercises in its sanctioning.

How much discretion does OFAC have under the new Supreme Court ruling?

For decades, U.S. courts followed the so-called Chevron doctrine, a legal precedent set by the Supreme Court in 1984. This doctrine allowed federal agencies like OFAC to interpret gaps or ambiguities in the law as long as their actions were deemed reasonable. Courts were generally bound to defer to the agency's reasoning, making judicial review more straightforward.

However, in a landmark ruling on June 28, the conservative majority of the U.S. Supreme Court overturned the Chevron doctrine. Chief Justice John Roberts, writing for the majority, argued that even in areas of legal ambiguity, it is ultimately the courts’ role to decide what the law means, not the agencies’. This ruling directly impacts cases like Diegelmann’s, where the interpretation of terms such as «procuring» or «operating in the Russian mining sector» is in dispute. The plaintiffs have seized on this ruling in their arguments before Judge Boasberg, citing it as a factor in their favor.

What Happens Next?

The judge must now decide whether to issue a ruling based on the submitted evidence or to convene an oral hearing. Depending on this decision, a ruling could come sooner or later.

Both parties retain the option to appeal the ultimate decision to the U.S. Supreme Court. However, whether the Court will agree to hear the case is entirely at the discretion of the justices. Given the overlap between this case and the recent Chevron ruling, it is not implausible that the Supreme Court could choose to take it on.

No matter the outcome, the legal showdown between U.S. authorities and the Liechtenstein gold dealer has now entered its most critical stage.