Spain will have to come into line with respect to the new 5% defence-spending-rule NATO is set to adopt although there will be flexibility on the application of the rules and timeframes, Deputy Premier and Foreign Minister Antonio Tajani told reporters on the sidelines of the NATO summit.

"We said that the objective could not be reached within the initial timeframe, and in fact it was extended (from 2032 to 2035)," Tajani said.

"The other Italian achievement regards flexibility.

There is the obligation to respect the objective, but not the 'timeframes'.

"Spain will have to respect the rules like everyone else - deeds are one thing, declarations are another.