Guyana says it's a false flag,

> "The government of Guyana — which borders Venezuela — said in a statement Wednesday the ship was falsely flying the Guyanese flag, despite not being registered in the South American country"

https://www.cbsnews.com/news/what-we-know-oil-tanker-the-ski...

(Context reminder: Guyana is the country Venezuela's Maduro threatened to invade in 2023).

(Also context: the sanctions on this ship's Russian owner date from 2022, and are about violating US sanctions on Iranian oil).