You left out the part where he warned the world what was coming, preemptively rebutted Russia's propaganda, and put together a global coalition to defend Ukraine. Sanctions on Russia to deplete their fighting ability, frozen assets of oligarchs that might be used to compensate Ukraine when this is over, etc.
It was the single most effective response to sovereign aggression in my lifetime. Even Barack wouldn't have done as well. And that Russia has nukes makes it all the more intrepid, bold and principled.