India's Buddhist diplomacy which is a significant aspect of India’s cultural diplomacy is constrained by several bottlenecks. 

India’s Buddhist Heritage

• Civilization core: India's sacred geography holds defining arc of Buddhist faith, including enlightenment at Bodh Gaya, first sermon at Sarnath, and mahaparinirvana at Kushinagar.
  • India currently has seven of eight most significant Buddhist sites globally including Nalanda, Shravasti, Rajgir, and Kapilvastu apart from above three sites.
• Historical Networks & Cultural Linkages: Deeply rooted in trans-Himalayan exchanges, tracing back to Emperor Ashoka's envoys and development of Mahayana Buddhism during Kushana period.
• Pilgrimage: India is the source of Theravada traditions defining spiritual identity of followers in Sri Lanka, Japan, Thailand, and South Korea, which forms most of Buddhist tourism in India. 

Underutilization of Buddhist Heritage for Soft Diplomacy

• Global Buddhist tourism market: India receives less than 1% of it.
• Lack of Integrated Branding: India still treats its Buddhist heritage as a set of isolated tourist stops rather than a cohesive national civilizational mission.
• Institutional & Academic Constraints: Academic and cultural initiatives, such as the revival of Nalanda University, have suffered from delays and domestic politics, falling behind regional competitors like China.