Specifically do you think that this move will render pressure to USA and EU to remove the financial sanctions or change policy?
Sure, the original calculation of the EU was that the negative impact of sanctions on its own economy would be insignificant, but now it’s a full-scale retaliation with substantial financial losses. Businesses don’t care too much about big politics and, therefore, may try to exert some pressure on governments to fix the issue with "crazy Russians" in order not to lose lucrative markets. This may create additional obstacles for Obama whenever he decides to hurt us even more with the next round of sanctions.

Also, a historical question: During the Soviet Union era (1917 - 1989) were any trade and economic relationships between Soviet Union and Western World?
Yes, we sold gas, oil and metals to the West those days, especially after WWII, exactly as we do now. And we used to buy lots of wheat because communism and agriculture are incompatible.