Pentagon to Russia: No More Cooperation From US Meetings, visits, conferences all nixed over Ukraine, spokesman says By Newser Editors and Wire Services Posted Mar 3, 2014 7:29 PM CST 73 comments Comments The Pentagon is seen from Air Force One. (AP Photo/Charles Dharapak, File) (Newser) – The Pentagon says it is suspending exercises and other activities with the Russian military, in light of Moscow's military involvement in Ukraine. A Pentagon spokesman, Navy Rear Adm. John Kirby, said today that the US military has "put on hold" all military-to-military engagements, including bilateral meetings, port visits, and planning conferences. Kirby said the Pentagon values the relationship it has developed with the Russian military in the last few years, to reduce the risk of military miscalculation. He said the US calls on Russian forces in the Crimea region of Ukraine to return to their bases.