"Collapse or failure of states result in ungoverned spaces that provide breeding ground for criminal enterprises in efforts of violence to form symbiotic relationship," Ghani said in his address at the 18th SAARC Summit here.
"The relation becomes lethal when state actors embrace and sponsor these non-state actors, provide them with resources and sanctuaries and use them as proxies in their competition against others," the Afghan leader said while strongly criticising those that provide safe havens to terrorists.
"We will not permit anybody to conduct proxy wars on our soil," he said, in a veiled warning to Pakistan.
Ghani said state sponsorship of non-state actors could have "blowback effects", and described the aftermath of a suicide blast at a volleyball game in Afghanistan that killed 57 people on Sunday.
Ghani's predecessor Hamid Karzai also frequently accused Pakistan of trying to destabilise the Afghan government by providing safe havens to Taliban fighters.
Addressing a lecture on 'Afghanistan and Neighbourhood', organised by Delhi Policy Group in New Delhi, he had said, "I don't think there is an alternative (to improving and bettering relations with Pakistan)...A few weeks ago, al-Qaeda threatened India. A few days ago, at Wagah border, a horrific terrorist act."
"We have to recognise those who have an interest in playing with the snake, the snake has already begun to bite the trainer," he said, referring to the terrorism emanating from Pakistan.