There is not an equivalent to SWIFT for cryptocurrency, but if you have a regulated industry with the gatekeepers, as Stéphane referred to, and the centralized platform to enable the exchange of crypto for fiat currency, you have incredible levers to prevent money from being moved via cryptocurrency and then exchanged for dollars. You need to have international co-operation, consistent regulatory frameworks and strong court systems that can bring about seizures of assets.
I would also remark that one of the things that's getting a lot of attention right now is Russian oligarchs who own soccer teams in the Premier League and $500-million yachts. On those $500 million yachts sitting in the Mediterranean, there are a number of very conventional means by which wealthy Russians have moved money out of Russia that are far more visible and yet continue to happen. There needs to be a continued, concerted effort across a range of asset classes, including crypto, to snuff out the ability of Russians to fund themselves and the current invasion.