however, since 2014 they have been isolating themselves from the likely effects of economic sanctions.
You will be aware that they are receiving vast heaps of money from European countries that did not develop alternative sources of energy to reduce their dependency on Russia oil and Gas. Therefore, if they lose access to international banking channels, Europe will not be able to buy energy from them, which would be inconvenient (maybe send truckloads of gold instead). By a surprising coincidence Russian fuel shipments have been rather low this year, resulting in huge price rises. Who could have seen that coming? Russia did, and has been increasing reserves of foreign currency and gold. The extra money received for high-priced oil and gas has been a great help to them.
US aerospace industry buys a lot of Titanium from the Russian Empire. Hmmmm. Put a stop to that, and who suffers from sanctions?
russians