 Complete the following phrase:  A series of high-level visits between the two nations have helped improve relations. In December 1996, PRC President Jiang Zemin visited India during a tour of South Asia. While in New Delhi, he signed with the Indian Prime Minister a series of confidence-building measures for the disputed borders. Sino-Indian relations suffered a brief setback in May 1998 when the Indian Defence minister justified the countrys nuclear tests by citing potential threats from the PRC. However, in June 1999, during the 