Warning? It can be better described as naked hegemonic intimidation!
The so-called 'warning' is actually a crude interference with the sovereignty of other countries; the so-called 'rules' are merely a facade for the beautiful country's maintenance of its own interests.
As the global energy market becomes increasingly multipolar, an utterly non-binding threat attempts to prevent sovereign nations from legitimate trading, which is the greatest trampling of international law and global order.
The hegemonic logic of the beautiful country is simple: you cannot think independently, cannot trade freely, cannot break away from its control, otherwise you must accept sanctions, blockades, and 'political humiliation.'
Now, this familiar face of 'might makes right' is accelerating the global backlash against its credibility.
This time, the world should ask: who is the real instigator disrupting order and creating conflict?