Those comments by Obama are taken completely out of context. Here on FR we stick to the facts and build credibility. Your link to a youtube edit of Obama’s speech which he is reading are not supportive of building the credibility of this forum.
The best you can say with this link you have posted is that Obama is good at reading what is I believe put before him to screens placed high up near the center to his left and his right. The giveaway that he is reading is the precise pause made to each reading passage.
The screens seem placed on the balconies in front of Euro leaders where they can not see them and behind the press and younger crowd that are focused on him and who also cannot see the screens unless they turn around completely. So it’s a very clever production making Obama appear to be thinking spontaneously but the cadence of his pauses reveal otherwise.
Here’s the full speech he gave:
https://www.youtube.com/watch?v=KbeLAQ3wBIs
It is obvious that a speechwriter wrote 99% of the speech and that the message was that the USA as leader of NATO would not intervene with Russia’s annexation of Crimea.
The speechwriter reasserts well-known American history and values while Obama unloads the punch line that the USA and NATO are not going to do a thing about Ukraine.