The system does not represent ownership the system only tracks of the validity of transactions and if the North Korean government proposes a valid transaction of your BTC or ETH to an address they control and a mining-node includes that transaction in a block which a majority of the network accepts then those assets are no longer yours they belong to North Korea.
The properties of the crypto-asset ecosystem which allow it to be ungoverned also make it ungovernable.
For those interested in this, CT (crypto twitter) makes tracking North Korea's stolen winnings a bit of a sport.
samczsun, an excellent security auditor who's working at Paradigm these days, broke down some of the org in a post the other day.
https://x.com/samczsun/status/1906754853063565720?t=N4aqa6Vy...
Taylor Monahan at MetaMask also makes a habit of tracing funds and shares some pretty interesting finds around NK's laundering efforts.