PESHAWAR (Reuters) - Afghanistan-based Pakistani Taliban leader Maulvi Fazlullah, a key figure in the insurgency, has vowed to return home to wage war. We sacrificed our lives, left our homes and villages for the sake of Sharia Law and will do whatever we can to get Sharia implemented in the Malakand region and rest of Pakistan, Sirajuddin Ahmad, a close adviser, told Reuters, describing Fazlullahs position. He was answering written questions submitted by Reuters. Fazlullah was the Taliban leader in Swat Valley, before a 2009 army offensive forced him to flee. Also known as FM Mullah for his fiery radio broadcasts, he regrouped in Afghanistan and established strongholds, and poses a threat to Pakistan once again, said army spokesman Major-General Athar Abbas. He is a prime example of the classic problem faced by military, one of the worlds biggest. Pakistan recently complained that Afghan and US-led forces had failed to hunt down Fazlullah who was responsible for a spate of cross-border raids. Ahmed said all Afghans, especially the Mujahideen, were supporting Fazlullah in Afghanistan. But he said the Afghan Taliban were not helping him stage cross-border raids in Pakistan. We are more secure and happy in Afghanistan than Pakistan, where the armed forces ruthlessly killed our people and subjected us to brutalities, Ahmad said. He alleged that Pakistani security forces had executed fighters in Swat. Military officials were not immediately available for comment, but they have in the past denied accusations of abuses. Other leaders of the Pakistani Taliban, an umbrella of about 12 groups, and the government have suggested they are open to peace talks to end a conflict that has killed thousands of people. But Fazlullah seemed sceptical about the governments intentions. Pakistani rulers always approach us through some people whenever their relations with the United States become unfriendly and make appeals to us to help them in restoration of peace in the country, said his adviser. But they forget their promises and become more harsh and cruel when their relations are restored with the United States. We know these tricks of the Pakistani rulers and do not trust in their promises. Fazlullahs advisor said his men would continue their fight against US-led forces in Afghanistan once they succeed in imposing Sharia Law in Swat. Residents there complained of public hangings and beatings during Fazlullahs rule. Fazlullah clearly re-emerged as a threat in recent months when his fighters took part in cross-border raids that killed around 100 Pakistani security forces, angering the army which faces threats from multiple militant groups. Fazlullah, a leading figure in the Pakistani Taliban insurgency, is based in Kunar and Nuristan provinces in Afghanistan, said Abbas. After Pakistan cleared Swat of militants in 2009, it maintained thousands of troops to prevent the Taliban from coming back. But analysts say the government needs to develop a more comprehensive strategy that tackles the underlying causes of militancy, such as unemployment and inadequate education. Pakistan has a weak economy heavily dependent on foreign aid so it doesnt have the resources to tackle those problems. Faced with a resilient enemy, the government has in the past tried to pacify militants through dialogue, which backfired.