The same time if EU freeze the Russian asset then Russian will also put same impose on EU assets in Russia. There is chances that these sanction can back fire.
In strategic point of View Russia will gain from this conflict, but if the strong long term conflicts arise between EU and Russia, then EU will be the looser. In short term EU will face the GAS crises, and US will enjoy this situation.
Ultimately the key is in the hand of BRICS economy. Strategically Russian and friendly relation with Indian and China. There is old saying in India. The exact looser in battle is "battle ground", where distraction take places. This time it is UKRAINE.