This entire war is a big waste of resources and time, and a great loss for family and friends from both sides that lost their loved ones and comrades fighting in the frontline.
What a grandiose comment.
As long as humans engage in politics and form collective groups, creating borders and then countries, wars and conflict will be a part of life.
For wars to be non-existent, borders must cease to exist. Different groups and ethnicity must abandon their identities. Countries must abandon all ambitions and dis-formed. All human species must be homogeneous.
For this war, the group of humans who identify as Russia feel threatened by another group--US/NATO--and their continued intrusion near them. Because they are weak economically and can't use that as influence to prevent this intrusion, they are using war to answer their problem. This war was inevitable the moment that 2014 revolution happened.
There are many more wars heading towards the human species in the future. Some predictable so.