Historically, Sino-Tibetan Buddhism describes the overlaps and interactions between Chinese and Tibetan Buddhism, which developed and were practiced over centuries in regions influenced by both traditions. In the 21st Century, Sino-Tibetan Buddhist modernism indicates several socio-political and cultural trends, including:
1) The embrace of Vajrayana Buddhism by Han Chinese practitioners and their devotion to Tibetan gurus,
2) An embrace of Vajrayana Buddhism as part of the Chinese heritage and experience by Chinese government bodies and individuals,
3) And the increased collaboration between the Sakya, Gelug, Kagyu, and Nyingma schools with Chinese institutions like universities and museums.
Taken together, these trends express a flourishing of the Dharma as expressed by the Diamond Vehicle within China, which we are only just beginning to comprehend.