Wu Sangui
In 1674, the Emperor asked the Dalai Lama to send Mongolian troops to help suppress Wu Sangui's Revolt of the Three Feudatories in Yunnan. The Dalai Lama refused to send troops, and advised Kangxi to resolve the conflict in Yunnan by dividing China with Wu Sangui. The Dalai Lama openly professed neutrality but he exchanged gifts and letters with Wu Sangui during the war further deepening the Qing's suspicions and angering them against the Dalai Lama. This was apparently a turning point for the Emperor, who began to deal with the Mongols directly, rather than through the Dalai Lama.