Finland and Russia already use different rail gauge, because Finland still uses the older Russian (Empire) gauge and Russia uses “Soviet” gauge. Its only a 4 mm difference but still any trains that would have to run both gauges have to be designed for both, which most of russian trains are not.

Also the electrical system is completely different

I can say some zigbee plugs have terrible/problematic antennas. I had a situation where:

Plug A <------> Plug B <-> Plug C, where B would have connetion issues but

Plug A <------> Plug C <-> Plug B would be solid

It maybe be that my selected zigbee band is not optimal for every device I use. That could also effect the range/signal strength

Finland ackshually has 25,5 % VAT ☝️🤓