Pakistan’s military leader, General Pervez Musharraf, challenged India Monday to agree to unconditional talks in the hope of averting war. He also blamed five decades of South Asian conflict on India’s refusal to let the Kashmiri people decide which country they want to join. But the Indian Prime Minister said Musharraf had kept none of his promises over the past six months, and cross-border infiltration by militants and violence in Kashmir has increased. The two leaders spoke at a regional security summit in Kazakhstan, where they sat at the same table for the first time in half a year. As both sides struggled to gain diplomatic high ground, Indian and Pakistani troops exchanged fire along the Line of Control, which divides Kashmir, killing eight civilians.