There are many possible methods of deterrence and reciprocal action. If you do nothing, the enemy has no reason not to escalate.
> If you do nothing, the enemy has no reason not to escalate.
Identifying your actual enemy is obviously step 1, and getting this right might be harder than you'd think.
Look at Nord Stream 2...
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>> There are many possible methods of deterrence and reciprocal action
What do you suggest?
Fully close the border with russia? Permanently deny any boat that makes port in russia access to EU ports, I could go on
Ban, arrest or damage "shadow fleet" tankers that transport Russian oil. Control their supply chain e.g. stop selling them spare parts for stolen planes. There are many things, all the way to taking hostages, but EU needs to grow some spine to do that.