Yes, it was an official declaration agreed to by the members.Was there an official vote for this or was it just some person saying, "Sure, we agreed to that" in the same way you agree to buying your kid a new pony hoping they just forget about it later.
Bucharest Summit Declaration
Issued by the Heads of State and Government participating in the meeting of the North Atlantic Council in Bucharest on 3 April 2008
link
Riley won’t try to parse this section from the declaration, because it directly contradicts his false assertions:
NATO welcomes Ukraine’s and Georgia’s Euro-Atlantic aspirations for membership in NATO. We agreed today that these countries will become members of NATO.