The sanctions following Russia’s invasion of Crimea were not sufficient to deter Putin from attacking Ukraine. Russia calculated the pros/cons, and determined t

The sanctions following Russia’s invasion of Crimea were not sufficient to deter Putin from attacking Ukraine. Russia calculated the pros/cons, and determined that the west would not impose significant sanctions, reducing the potential costs. The west should cut off all oil/gas from Russia, and sanction anyone who purchases oil/gas from Russia.