McGregor may be wrong but Petreaus or this administration has yet to explain what the US vital national security interest is in a war to place their 100 billion dollar bet (to date) on
with no limit yet in sight. Russia is not the USSR and the global monolithic threat it was. It is a kleptocracy that may pose a regional threat to Europe who should be funding the war, not the US.
Russia being a 'regional threat' to Europe is a threat to the US because of the NATO alliance.