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In 2009, President Obama could not attend the NATO meeting in Brussels. He was otherwise occupied that day. (It was Inauguration Day.) Here is the message he sent to NATO: http://www.nato.int/docu/speech/2009/s090120a.html
Here is President Obama addressing NATO in 2016: https://www.washingtonpost.com/world/transcript-president-obama-gives-speech-addressing-europe-russia-on-march-26/2014/03/26/07ae80ae-b503-11e3-b899-20667de76985_story.html?utm_term=.5072718f4b24
Here is an analysis of the differences between Obama and Trump: 
http://natoassociation.ca/5-differences-between-trump-and-obamas-nato-speeches/
People who love the United States can be forgiven if they weep when contemplating what the presidency of Donald Trump has wrought.