By Andrew Gray and Lili BayerBRUSSELS, July 3 (Reuters) - NATO leaders including U.S. President Donald Trump are set to affirm an "ironclad commitment" to collective defence under the alliance's Article 5 pact at a summit in Ankara next week, according to a text approved by NATO ambassadors on Friday and reviewed by Reuters.NATO members are also set to pledge €70 billion ($80 billion) in military assistance to Ukraine for 2026 and "at least equivalent levels" of support in 2027, according to the declaration, which still needs final approval from the leaders at the summit.

At the Ankara summit, NATO members are expected to address questions over defense spending and the U.S.’s evolving role in the alliance.

US President Donald Trump expects all Nato allies attending next week's summit in Ankara to be on a path toward spending 5 per cent of Gross Domestic Product (GDP) on defence and…