The measures mark one of the country’s strongest moves yet against Russia’s use of cryptocurrencies and alternative payment systems. For the first time, the U.K. applied Regulation 17A of its Russia sanctions regime to crypto exchanges, a tool previously used against sanctioned banks.

Under the rules, U.K. financial firms and crypto service providers cannot maintain correspondent relationships with the designated entities or process payments tied to them. Companies may also need to freeze funds and trace blockchain transactions linked to sanctioned platforms.

Elliptic said the rules could require firms to trace transactions across multiple blockchain “hops,” meaning compliance checks would extend beyond direct counterparties to wallets and exchanges appearing anywhere in a transaction chain.

A major focus of the sanctions package is the Kremlin-backed A7 payments network, which British officials say helped process proceeds from Russian oil sales and supported military procurement. The U.K. says the network moved more than $90 billion last year.

Elliptic said other regulators are likely to watch closely as Britain tests a new model for applying traditional financial sanctions rules to digital asset markets.

The sanctions took effect immediately. CoinDesk has reached out to Huobi for comment but did not hear back by press time.

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