Maybe you are right Walter, but the Iranians are pretty good at smuggling weapons for their proxies (Houthies, Hezbollah, etc), Isis caused some serious mayhem with Toyota pickup trucks and automatic rifles mounted in the rear.
The Dutch are sending Stingers for example, I guarantee you they are not sending dutch operators with them:
The Netherlands will deliver 200 Stinger anti-aircraft missiles to Ukraine as soon as possible, the Cabinet said on Saturday. The decision comes after additional requests from Ukraine for military goods. For this request, a careful, but shortened, assessment against the arms export criteria took...
nltimes.nl
I agree that the Russians will find out it may be hard to keep their gains, at least while their supply lines come from Russia. Once they take over it would be easier to settle in Ukraine.
My frustrations are at our own incompetence, at our failures of imagination of not putting ourselves in the mind of our adversaries. Specifically at the tired slogan that the enemy is rational that highly paid think tanks keep repeating. The rationality of your enemy is a stupid and expensive assumption I rebel against. Putin, by putting Russia's nuclear arsenal in ready state, is proof of that.