Where exactly do you see any illegal action? Please elaborate. It becomes illegal when we lose. Before that its risk management.
Look this tanker here for example, got neutralized by a single drone, another one followed. That alone escalated the risk to the point that shipping companies avoid russia.
As for the terminal, its still closed by today. The image is from November.
As for now, all terminals at Novorossiysk are closed.
I checked, this is all tankers in the black sea at the moment. Looks good for me:
View attachment 54153
So oil transport through black sea is down by 100% as for today.
And thats why attacking those tankers was so important. Shipholders are easily scared away by such things.