India has widened its lead over Pakistan in terms of nuclear warheads, according to the latest assessment from the Stockholm International Peace Research Institute (SIPRI). The SIPRI Yearbook 2026 estimates that India’s nuclear arsenal stood at approximately 190 warheads as of January 2026, compared with Pakistan’s estimated stockpile of 170 warheads. The findings underscore the continuing evolution of the India-Pakistan nuclear balance at a time when global concerns over nuclear weapons modernization and strategic competition are intensifying.

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The latest figures indicate that India has increased its nuclear warhead count from the estimated 180 warheads reported a year earlier, while Pakistan’s nuclear stockpile has remained relatively stable. The development gives India a lead of around 20 warheads over its western neighbour and reflects broader trends in South Asia’s strategic landscape.

SIPRI Yearbook 2026 highlights growing nuclear competition

The SIPRI Yearbook 2026 warns that the world is entering a new phase of heightened nuclear competition. According to the institute, countries are increasingly relying on nuclear weapons as instruments of national power even as long-standing arms control arrangements continue to weaken. SIPRI said the risks of escalation, miscalculation and strategic instability are growing across multiple regions, including South Asia.

The report noted that both India and Pakistan continued efforts to modernize their nuclear forces throughout 2025. While the numerical difference between the two countries remains relatively small, the modernization of delivery systems, command structures and strategic capabilities is becoming an increasingly important factor in assessing regional deterrence.

India nuclear arsenal expansion linked to modernization efforts

Analysts cited in SIPRI’s assessment suggest that India’s nuclear arsenal growth is closely linked to its broader military modernization program. The report indicates that India has been developing advanced capabilities including canisterized missile systems, longer-range delivery platforms and technologies associated with multiple independently targetable re-entry vehicles, commonly known as MIRVs. These developments are intended to enhance the credibility and survivability of India’s nuclear deterrent.

SIPRI’s researchers also observed that India’s strategic planning is increasingly influenced by China’s growing military capabilities. While the India-Pakistan nuclear rivalry remains a central security concern, experts believe New Delhi’s long-term modernization efforts are increasingly designed to address a broader regional security environment.

Another significant trend highlighted in the SIPRI Yearbook 2026 is the growing importance of sea-based nuclear forces. Experts noted that submarine-based deterrence enhances survivability because these assets are more difficult to detect and target during a conflict. SIPRI indicated that sea-based capabilities are becoming a cornerstone of India’s evolving nuclear posture.

India-Pakistan nuclear balance remains a key security concern

The India-Pakistan nuclear relationship continues to attract global attention due to the history of military confrontations between the two countries. SIPRI described recent periods of cross-border tension as reminders of how rapidly crises can escalate between nuclear-armed states. Security experts frequently point out that maintaining reliable communication channels and crisis-management mechanisms remains essential for regional stability.

Although Pakistan’s nuclear stockpile remains close to India’s in numerical terms, the two countries differ significantly in nuclear doctrine and strategic planning. Various international assessments have noted that India maintains a declared No First Use policy, while Pakistan relies more heavily on tactical nuclear weapons as part of its deterrence strategy. These doctrinal differences continue to shape the strategic calculations of both countries.