Notice that Klobuchar is sitting at the same table with McCain and Graham along with our now infamous ambassador. Graham sees himself as the architect of our policy with Ukraine. He is pushing not only to provide lethal aid to Ukraine, but also, to have them enter NATO. IMO one of the reasons that Putin invaded Crimea was to ensure that the Russian base would remain even if Ukraine entered NATO. And a Ukraine in NATO also raises the possibility of a conflict with Russia under Article 5.
You can see from the testimony this week that our diplomats seem to be representing Ukrainian interests more than US interests. Since when is Ukraine vital to our national interests?