- An economic sanction does not kill people (not directly nor quickly).
- Economic sanctions mean simply that other countries do not want to trade with you. That is not fighting, is simply a effect of failing to have a successful relation with the international community.
- Economic sanctions are reversible. It is Putin's hand to take the steps to come back into the international community.
Obviously, sanctions are not the same as bombing a country or shooting at a country's military. Going from sanctions to actual violence is a major escalation.
You obviously do not understand what is legally a war, and what is worse, you have not bothered to look for any conventional definition of act of war. A word of advice, sometimes using Google is fine.
War -
he is a leader of a nazi regime,
...
Oh, just drop it my, you are making a fool of yourself trying this over and over.