NYT:

“Within half an hour, they attacked,” recalled Officer Najibullah Amiri, 35. The Taliban swarmed the farmlands surrounding his post and seized the western riverbank here in Farah, the capital of the province by the same name.

It was the start of a three-week siege in October, and only after American air support was called in to end it and the smoke cleared did Afghan security officials realize who was behind the lightning strike: Iran.

Four senior Iranian commandos were among the scores of dead, Afghan intelligence officials said, noting their funerals in Iran. Many of the Taliban dead and wounded were also taken back across the nearby border with Iran, where the insurgents had been recruited and trained, village elders told Afghan provincial officials.

The assault, coordinated with attacks on several other cities, was part of the Taliban’s most ambitious attempt since 2001 to retake power. But it was also a piece of an accelerating Iranian campaign to step into a vacuum left by departing American forces — Iran’s biggest push into Afghanistan in decades.

Iran has conducted an intensifying covert intervention, much of which is only now coming to light. It is providing local Taliban insurgents with weapons, money and training. It has offered Taliban commanders sanctuary and fuel for their trucks. It has padded Taliban ranks by recruiting among Afghan Sunni refugees in Iran, according to Afghan and Western officials.

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