India–Pakistan

What it is

India and Pakistan are the world's only nuclear-armed pair to have fought four full-scale wars, all rooted in the disputed status of Jammu and Kashmir. Both became independent on 14-15 August 1947 when Britain partitioned its Indian subcontinent. The Line of Control (LoC), codified by the July 1972 Simla Agreement, divides Kashmir into Indian- and Pakistan-administered zones and functions as the de facto boundary, though neither side accepts it as final. SIPRI estimates India held approximately 190 nuclear warheads and Pakistan approximately 170 as of January 2026. India spent US$92.1 billion on defence in 2025, the fifth-largest total globally. The UN Military Observer Group in India and Pakistan (UNMOGIP), established January 24, 1949, continues monitoring ceasefire compliance along the LoC from headquarters in both New Delhi and Islamabad, making it one of the UN's oldest and most contested peacekeeping operations.

History

The 1947 Partition displaced up to 15 million people and is estimated to have killed between 200,000 and two million in communal violence. Kashmir's Maharaja signed accession to India in October 1947; Pakistan disputed that act immediately, triggering the first war (1947-48). Three more followed: 1965 (no territorial change), 1971 (East Pakistan became Bangladesh), and 1999 Kargil, the first armed conflict after both states tested nuclear weapons in May 1998 and the first time nuclear-armed states fought a sustained conventional battle since the Cold War. Subsequent crises were driven by attacks attributed to Pakistan-based groups: the December 2001 Indian Parliament attack, the November 2008 Mumbai attacks (166 killed, attributed to Lashkar-e-Taiba), the 2016 Uri attack (India conducted cross-LoC "surgical strikes"), and the February 2019 Pulwama bombing (40 security personnel killed), which produced Indian air strikes at Balakot and the first aerial combat between nuclear-armed states. The Siachen Glacier, where both armies have held positions since 1984, was addressed by no ceasefire and remains a live friction point at altitude (see 在萨尔托罗山脊，停火从未触及的印巴战争).

Current state

The April 22, 2025 Pahalgam attack killed 26 tourists in Indian-administered Kashmir, the deadliest attack in Indian territory since Mumbai 2008. India launched Operation Sindoor on May 6-7, striking nine sites in Pakistan and Pakistan-administered territory; SIPRI's 2026 Yearbook notes India targeted bases with probable nuclear-related roles, and both sides stepped back. A ceasefire took effect May 10, 2025 at 5pm IST. Indian Prime Minister Narendra Modi characterised Sindoor as suspended rather than concluded. Since then, India placed the 1960 Indus Waters Treaty in abeyance, conditioning restoration on Pakistan ending cross-border militancy; Pakistan responded with international legal and diplomatic moves, hosting a foreign-government conference June 30-July 1 (see 印度暂停条约进入第三个月，巴基斯坦就印度河水条约召开国际会议) and pursuing UNSC and arbitration channels (see 印度暂停印度河水条约，巴基斯坦警告爆发'水战争'). The militant front has migrated from the Kashmir Valley into Jammu's Pir Panjal forests (see 克什米尔战火南移：武装分子撤出山谷，扎进查谟的皮尔潘贾尔森林). India restructured its Army into Integrated Battle Groups for rapid western-front operations (see 印度7月1日启动首批四支一体化战斗群，重组陆军以适应多域战争). As of July 2026, both diplomatic ties and bilateral trade remain suspended.

Relationships

India's key external anchors are the US-led Quad (defence and technology cooperation) and Russia (inherited arms supply). Pakistan's primary partner is China: the May 2026 China-Pakistan joint statement upgraded the relationship to an "all-weather strategic cooperative partnership," adding CPEC 2.0 and a formal security framework. The US approved US$1.3 billion in EXIM Bank financing for Pakistan's Reko Diq copper-gold project in February 2026. The India-China-Pakistan triangle is the operative strategic geometry: India modernises its military primarily against China, but Pakistan remains the immediate doctrine test bed. Cross-border narcotics pipelines from Pakistan into Indian Punjab sustain militant networks as a sub-LoC friction track (see 旁遮普毒品恐怖主义管道：无人机投送、BKI模块被捣毁，以及加拿大与印度的关系重置). Islamabad's June 2026 ban on a protest movement inside Pakistan-administered Kashmir over basic services (see Pakistan bans its own Kashmir protest movement as Rawalakot deaths fuel anger in Azad Kashmir) illustrates the internal pressure Pakistan faces on the territory it claims to champion internationally.

What to watch

Whether India converts the Sindoor "suspension" into a standing deterrent threat or allows a diplomatic channel to reopen. Whether Pakistan succeeds in internationalising the Indus water dispute via the UN Security Council or the Permanent Court of Arbitration. The pace of Chinese military technology transfer to Pakistan and its effect on escalation thresholds. Whether India-US defence co-production materially shifts the conventional balance. Internal stability inside Pakistan-administered Kashmir, where economic grievances and political repression risk a new cycle of unrest.