NATO Secretary-General Jens Stoltenberg on Tuesday warned against a hasty withdrawal of US troops from Afghanistan and said the price for leaveing too soon could “be very high”.

NATO currently has less than 12,000 troops from dozens of countries in Afghanistan, while the US is now down to around 4,500.

This comes after US President Donald Trump’s expected drawdown of troops before he leaves office in January.

Stoltenberg said in a Tuesday statement: “We now face a difficult decision. We have been in Afghanistan for almost 20 years, and no NATO ally wants to stay any longer than necessary. But at the same time, the price for leaving too soon or in an uncoordinated way could be very high.”

He said the country still “risks becoming once again a platform for international terrorists to plan and organize attacks on our homelands. And ISIS (Daesh) could rebuild in Afghanistan the terror caliphate it lost in Syria and Iraq.”

AP reported, along with other news agencies, that US officials said military leaders were told over the weekend about the planned withdrawal and that an executive order is planned but has not yet been delivered to commanders.

Stoltenberg said that “even with further US reductions, NATO will continue its mission to train, advise and assist the Afghan security forces. We are also committed to funding them through 2024.”

NATO’s security operation in the country is its biggest and most ambitious undertaking ever. It was launched after the military alliance activated its mutual defense clause — known as Article 5 — for the first time, mobilizing all the allies in support of the United States in the wake of the 9/11 attacks on New York and Washington, AP reported.

“Hundreds of thousands of troops from Europe and beyond have stood shoulder to shoulder with American troops in Afghanistan, and over one thousand of them have paid the ultimate price,” Stoltenberg said.

“We went into Afghanistan together. And when the time is right, we should leave together in a coordinated and orderly way. I count on all NATO allies to live up to this commitment, for our own security,” he said.