Nagorno-Karabakh conflict led to full-scale war between?

The Nagorno-Karabakh conflict is a deeply rooted ethnic and territorial dispute primarily between Armenia and Azerbaijan. This volatile region, internationally recognized as part of Azerbaijan but historically populated by ethnic Armenians, has been a flashpoint for decades. The conflict escalated into full-scale wars multiple times, most notably in the early 1990s, 2020, and 2023, directly involving the armed forces of both nations. Therefore, Armenia and Azerbaijan is the accurate answer.

• Russia and Ukraine are engaged in a separate, ongoing geopolitical conflict.
• China and India have long-standing border disputes in the Himalayas.
• The conflict between Israel and Palestine is centered in the Middle East, involving complex historical and religious factors.

These are distinct international issues unrelated to Nagorno-Karabakh.