I'm essentially sandbagging on this question since I'm dropping in after the summit and details on agreements are being reported.
Key Text:
"In order to bring Madrid on board, the new language that leaders will approve on Wednesday was changed from "we commit" to "allies commit" to spend 5 percent on defense, a NATO official said. That would allow Spain spending flexibility as long as it meets NATO's updated capability targets approved by alliance defense ministers on June 5.
In a statement on Sunday, Sánchez described the outcome as a “success,” which will allow Spain to “fulfill its commitments to the Atlantic alliance and preserve its unity, without having to increase defense spending to 5 percent of GDP."" [1]
Trump has also said the US will not have to pay the 5%. [1]
Irrespective of the US, Spain got what it wanted so there is no incentive for them to change their position over the next 29 days. Perhaps they'll agree to something higher at a later time, and they may have more pressure applied to them as other countries presumably increase their spending to meet the 2035 timeline, but any sort of increase is likely outside the timeframe of this question.
[1] https://www.politico.eu/article/nato-allies-defense-spending-goal-spain-gdp/#:~:text=Spain%20threw%20up%20a%20last,way%20after%20being%20granted%20flexibility.&text=NATO%20allies%20have%20reached%20a,officials%20told%20POLITICO%20on%20Sunday.
Other links
NATO Official press release from summit
https://www.nato.int/cps/en/natohq/official_texts_236705.htm
Defence expenditures and NATO’s 5% commitment
https://www.nato.int/cps/en/natohq/topics_49198.htm
By what measure would this be determined? Perhaps The Economist Intelligenc Unit's (EIU) Democracy Index could be used.
https://www.eiu.com/n/campaigns/democracy-index-2024/
https://ourworldindata.org/grapher/democracy-index-eiu
Otherwise, this has potential to be an "ignition question" that could generate a question set.