This is exactly why comparative advantage is complete BS. When you let another foreign entity control your means of whatever it may be (rocketd, iPhones, car parts, tools, etc etc) you lose that ability to utilize it when the political poo hits the fan.
I disagree. It's quite possible that this decision wasn't made lightly. I'm sure there are some Russian businesses which are being hurt by this. When countries trade with each other, and become dependent upon each other, there's a higher motivation not to go to war with each other or let political poo hit fans. While trade dependency is a strategy that kind of hurts when war breaks out, it decreases the likelihood of that war actually breaking out.
I think that policies should be optimized for day to day living during peacetime, not war.