Its not a contradiction, several politicians, Biden included, spoke of what would happen if the US threatened NATO expansion into Ukraine. Obama, McCain, Kerry, Nuland, and now Biden set the stage for Ukraine to get invaded. Claiming it was to protect democracy which is bullshit. If the US cared about democracy and sovereignty they wouldn't have orchestrated a coup with the Pakistanian PM.
This war is 100% about decimating Ukraine so capitalists can go in and divide the spoils.