Yi Peng 3 crossed both cables C-Lion 1 and BSC at times matching when they broke

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?

That would not swing.

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.

I'd consider the serious escalation of offensive (cowardly) acts were carried out by Russia many many years ago repeatedly, increasingly, throughout Europe (elsewhere too), with mild consequences. Got seriously unabashed escalating further. Being cautious with the nazi Germany blew into the face of the World, will definitely not work with the imperialist Russia either. China acts on behalf of Russia here - Russia being coward for open confrontation with anyone (believed by them) able hitting back hard. China has secondary benefits for self as well.