— “You probe with bayonets: if you find mush, you push. If you find steel, you withdraw”
They do this relentlessly until they face consequences too costly to continue. Negotiations and agreements are simply, and accurately seen as "I won, I can continue making bigger offenses, and the opponent will do nothing (they won't violate the agreement while I do)" .
I mentioned sanctions first because they can often be more effective than kinetic and less escalatory. That does not mean they should be off the table, particularly kinetic responses with plausible deniability.
But no, this is not a political issue. A political issue would be dumping goods onto the market at sub-production-cost or undercutting us on a deal with an ally. This is a violation of territory just as if they'd broken the locks on the buildings to come in and sit down at the keyboards.