This is the 2nd time China did this in that Baltic isn't it? Both times look intentional.. maybe don't allow Chinese ships in the Baltic?
Both of the two Chinese registries are open, pretty much anyone can register ships there. It's a bit like the .tv domain — if you see something.tv you can't assume that it's a company in the country Tuvalu.
Look at the nationality of the captain and the beneficial owner instead.
how do you intend to "motivate" a sovereign country?
Consequences can range from inconvenient to existential.
Denmark controls the waters of the seaway to Sct. Petersburg and Kaliningrad that are some of the strategically most important ports of Russia.
Blocking of traffic to these would be a severe escalation.
Regularly Russian subs pass through Danish waters - controlled and allowed.
As severe as... say starting the largest war in Europe since WW2 right at our doorstep? Or as damaging our critical infrastructure? Or manipulating our democratic processes?
It's time the West pulls its head out of its ass. We're already at war, whether we want it or not.
I've always wondered how subs handle tidal flows there, and how challenging the tidal flows are.