South Asia does not exist in a vacuum and is influenced by outside powers and events despite attempts to insulate itself from non-regional powers. China and the United States remain key players in South Asian politics, shaping bilateral relations in the region.

China's strategic partnership with Pakistan serves as a major example of external influence. While Sino-Indian relations have improved significantly in recent years and economic ties have multiplied rapidly since 1991 due to development and globalisation demands, China's close ties with Pakistan remain a persistent irritant in India-China relations. This demonstrates how external powers can complicate bilateral relationships within South Asia.

American involvement in South Asia has rapidly increased after the Cold War. The US maintains good relations with both India and Pakistan and increasingly works as a moderator in India-Pakistan relations. Economic reforms and liberal economic policies have deepened American participation in the region. Additionally, the large South Asian diasporas in the US and the region's huge population and markets give America a significant stake in regional security and peace.

However, whether South Asia remains conflict-prone or evolves into a regional bloc with common cultural features and trade interests depends more on the people and governments of the region than on any outside power.