NATO Secretary General Jens Stoltenberg said on Thursday allies will discuss Afghanistan during Friday’s defence ministers meeting, which will be “the first opportunity for the ministers to engage in the lessons learnt process” launched by the organization.

NATO defense ministers are meeting Thursday and Friday in Brussels to chart the course for the alliance as it modernizes and adapts to a world dominated by strategic competition.

However, the discussions will also include Afghanistan, Stoltenberg said during a press conference Thursday. According to him “we are in the midst of the lessons learned process, I think it’s a bit early to draw final conclusions.”

He said the decision to withdraw all troops from Afghanistan had been “a very difficult dilemma” but after extensive rounds of consultations among all allies, “we agreed together to end our military presence in Afghanistan”.

Stoltenberg said the lesson learned process has to focus on both what did not work, but also what worked, and he said “we should recognize that we actually made significant achievements”.

“Our mission was not in vain. We prevented Afghanistan from being a safe haven for international terrorists, and prevented any attack against any NATO ally over 20 years.

“Now we will stay vigilant and preserve those gains. Not least by holding, using the leverage we have on the new Taliban (Islamic Emirate) regime to make sure that they live up to their commitments on terrorism, on human rights, and safe passage.”

“The international community has economic and diplomatic leverage over the Taliban (Islamic Emirate),” he said.

“Looking ahead, we must continue to stand together in the fight against international terrorism,” he said. “And in the margins of this ministerial, we will hold a meeting of the Global Coalition to Defeat Daesh [or the Islamic State group],” he said.