What should the international norm for cyber look like?

proxy and proxy wars are currently the norm and not limited to cyberspace. What do you proposed as a international norm for cyberspace between countries? The US's stated position is to retaliate with kinetics if necessary...of course between great powers, that means the escalation to nukes.

Most do, but not their operational systems (at least not in a control and measured approach). They have a business to run.

Hacking is about exploiting weaknesses and flaws. Under that same line of thought using stealth to exploit flaws or using electronic warfare technology to produce multiple or deceptive tracts in Radar would be consider nefarious....

Yes, sir, that is true; however, the hacking of US computers by both Russia & China has been done in peace time and with full diplomatic relations. That would make their snooping stealing. Of course, US signal gatherings and other electronic eavesdropping also is at best unethical. I will go with the fact that both Russia & China do not abide with their word and so agreements with them are spurious.

Espionage is not necessarily the problem, there are provisions in international laws and agreement for that. Individual profiting from hacking on behalf of the government is another story. finally snooping and stealing isn't necessarily the focus of the agreement, causing damage like shutting down electrical systems, collapsing finance infrastructures, or shutting down a government is....which can result in a war.