According to Reuters, UK and US regulators have disagreements in advancing crypto cooperation, with the core dispute over how to test blockchain-based tokenized securities. The UK favors conducting experiments within a regulated "sandbox" environment, while the US is concerned about the commercial viability of the sandbox model and its impact on innovation, leaning more towards considering an "exemption relief" approach. The report also states that both sides remain generally aligned on tasks such as stablecoin regulation and continue to promote future rules coordination and mutual recognition arrangements for market participants.