Russia Preparing for MitM
groups.google.com
groups.google.com
The integration of an actor into global financial, information systems provides leverage and control. The world historically tried to include even the bad guys for that reason.
Meanwhile, EU/US have not given themselves an escape hatch to reverse the sanctions. If Putin stops because tanks ran out of fuel, does it mean Putin is no longer a bad guy so the country can be included again? Hardly something the wording of sanctions would allow.
If you really wanted to raise some new hairs on Putin you'd disconnect the trunk, but there would be suffering. Could we invent a best of both?
Radio is attractive, but can be detected and triangulated (although receiving is fine). Plausible deniability (high entropy signals) is a theory. How do we exfiltrate?
If things truly did get that bad.. Setup a number of highly focused/directional wifi links near the border, ideally with irregular transmission schedules to make it harder to catch. Use a popular decentralized multiplayer game's protocol (e.g. Minecraft) as cover for P2P requesting and distributing content.
You might want to spend some time reading about signal theory.