Was Russia provoked into invading Ukraine ?

Sort of, yes. The U.S is interested in Ukraine's natural resources and has an innate and unchanging dislike of Russia, which is really why they're supporting Ukraine. Russia shouldn't invade other countries and it's horrible to target civilians, but this war is complex and the West are at fault. A diplomatic solution should be encouraged...it isn't because Ukraine is too stubborn and the West can't be diplomatic with Russia.
They have a right to keep fighting, but at some point you have to question the cost and whether it'll actually be worth it in the end. Russia won't give in unless they are offered part of Ukraine, so it may last a very long time.

Ukraine could just end up a desolate wasteland.