The U.K. sanctioned three cryptocurrency exchanges on Thursday as part of a package of 38 new designations targeting financial networks it suspects are helping Russia evade sanctions. The action freezes the U.K. assets of the named entities and bars British financial institutions from processing payments to, from or through several of the firms.

The Foreign Office named Xeltox Enterprises, the Canadian-registered company behind the exchanges Cryptomus, Heleket and Certa Payments, alongside Kyrgyzstan-based TokenSpot. It also designated payment platforms Processing KG, which operates VexPay, and Tsunami Payments, plus Ulan Bukabaev, a director of Processing KG.

What is the A7A5 connection?

The government said two of the targeted businesses processed or facilitated transactions involving A7, a Kremlin-backed network that operates the ruble-pegged A7A5 stablecoin, which Britain says is used to bypass sanctions on Russia's financial sector. A7 claimed last year to have moved more than $90 billion, according to the U.K. government statement.

The designations extend scrutiny beyond exchanges already linked to the network. British authorities previously sanctioned Grinex and Garantex. The U.S. later targeted the companies and executives behind both the token and the exchanges.

Blockchain-data firms have disputed how much A7A5 activity is actually occurring on-chain, a caveat that complicates official estimates of the network's throughput.

How does this fit the wider sanctions push?

Thursday's package goes well beyond crypto. It covers Russian oil producers Zaribezjmeft and INK Capita, 12 shadow-fleet tankers and suppliers of machinery, electronics and other goods the U.K. says feed into Russia's missile and drone production.

The U.K. sanctioned several other crypto exchanges in May, including Huobi and HTX, accusing them of helping Russia evade Western sanctions. The European Union deployed its own twenty-first sanctions package against Russia in July, targeting 14 crypto companies along with four designations related to the cross-border A7 network.

For the designated exchanges, the operational consequences are immediate: any assets held in the U.K. are frozen and British banks can no longer touch their payment flows. With Washington, Brussels and London now all pursuing entities tied to A7A5, compliant fiat and banking rails will keep narrowing for exchanges serving Russian-linked volumes.