Army units heading to Eastern Europe

From annawiki

http://www.armytimes.com/article/20140422/NEWS08/304220055/4-Army-units-heading-Eastern-Europe

  • "reassure our allies and partners … of our commitment to Article 5" - This would be http://www.nato.int/cps/en/natolive/official_texts_17120.htm "The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack" ... Is Ukraine in the NATO already?