They seem to be able to more easily acquire flags of convenience from further away, and optionally some kind of nominal insurance from different providers likely to pass muster at a first glance (I have zero maritime expertise and just wanted to add some supplementary context to the parent of your post).

https://en.wikipedia.org/wiki/Russian_shadow_fleet

https://eutoday.net/eu-sanction-issuers-of-fake-flags-to-rus...

https://www.nytimes.com/interactive/2023/05/30/world/asia/ru...

https://www.nrk.no/vestland/xl/over-100-ships-have-sailed-wi...