What should be the U.S. response to the Russian’s actions in Ukraine?

Putin is a known entity.  There is no “intelligence failure” here.  The reality is that we are unable to thwart or control the actions of everyone in this wide world, demonstrated by 9/11, Benghazi, or the re-occupation of Crimea.  Putin’s political view is for a “Greater Russia”.  What will the world leaders do about him?  Perhaps we should send a drone with his name on it.  We have started with diplomatic dialogue, and condemning Putin’s military action in Ukraine’s sovereign territories.  (In 2008 W. Bush stopped with verbal support for Georgia, when Russia invaded and took it over.)  Planning for the G-8 summit in Sochi has been suspended.  U.S. is pledging $1B economic package, and EU is sending $158B in aid to help prevent the Ukrainian collapse.  U.S. has suspended military training with Russia, and has begun training with Poland.  The Pentagon has stepped up patrolling air space over the Baltic Peninsula.  U.S. may consider economic sanctions against Russia, but Pouty Putin has threatened aggressive retaliation if sanctions are imposed.  We need to fast-track adding Ukraine and Crimea to NATO membership.