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The Kargil War, also known as the Kargil conflict, was fought _______ India and Pakistan from May to July 1999 in the Kargil district of Jammu and Kashmir and elsewhere along the Line of Control (LoC). In India, the conflict is also referred to as Operation Vijay, which was the codename of the Indian military operation in the region. The role of the Indian Air Force in acting jointly with the Indian Army was aimed at flushing out both the Pakistan Army and irregular Pakistani troops from vacated Indian positions along the LoC, in what was designated as Operation Safed Sagar. The conflict was triggered by the infiltration of Pakistani troops—disguised as Kashmiri militants—into strategic positions on the Indian side of the LoC, which serves as the de facto border between the two countries in the disputed region of Kashmir. During its initial stages, Pakistan blamed the fighting entirely on independent Kashmiri insurgents, but documents left behind by casualties and later statements by Pakistan's Prime Minister and Chief of Army Staff showed the involvement of Pakistani paramilitary forces, led by General Ashraf Rashid. The Indian Army, later supported by the Indian Air Force, recaptured a majority of the positions on the Indian side of the LoC; facing international diplomatic opposition, Pakistani forces withdrew from all remaining Indian positions along the LoC. The Kargil War is the most recent example of high-altitude warfare in mountainous terrain, and as such, posed significant logistical problems for the combatting sides. It also marks one of only two instance of conventional warfare between nuclear-armed states (alongside the Sino-Soviet border conflict). India had conducted its first successful test in 1974; Pakistan, which had been developing its nuclear capability in secret since around the same time, conducted its first known tests in 1998, just two weeks after the second series of tests by India.

After the Indo-Pakistani War of 1971, there had been a long period with relatively few direct armed conflicts involving the military forces of the two neighbors—notwithstanding the efforts of both nations to control the Siachen Glacier by establishing military outposts on the surrounding mountains ridges and the resulting military skirmishes in the 1980s. During the 1990s, however, escalating tensions and conflict due to separatist activities in Kashmir, some of which were supported by Pakistan, as well as the conducting of nuclear tests by both countries in 1998, led to an increasingly belligerent atmosphere. In an attempt to defuse the situation, both countries signed the Lahore Declaration in February 1999, promising to provide a peaceful and bilateral solution to the Kashmir conflict. During the winter of 1998–1999, some elements of the Pakistani Armed Forces were covertly training and sending Pakistani troops and paramilitary forces, some allegedly in the guise of mujahideen, into territory on the Indian side of the LOC. The infiltration was codenamed "Operation Badr"; its aim was to sever the link between Kashmir and Ladakh, and cause Indian forces to withdraw from the Siachen Glacier, thus forcing India to negotiate a settlement of the broader Kashmir dispute. Pakistan also believed that any tension in the region would internationalize the Kashmir issue, helping it to secure a speedy resolution. Yet another goal may have been to boost the morale of the decade-long rebellion in Jammu and Kashmir by taking a proactive role. Pakistani Lieutenant General Shahid Aziz, then head of the ISI analysis wing, has confirmed there were no mujahideen but only regular Pakistan Army soldiers who took part in the Kargil War. "There were no Mujahideen, only taped wireless messages, which fooled no one. Our soldiers were made to occupy barren ridges, with handheld weapons and ammunition", Lt Gen Aziz wrote in his article in The Nation daily in January 2013.

Some writers have speculated that the operation's objective may also have been retaliation for India's Operation Meghdoot in 1984 which seized much of Siachen Glacier. According to India's then army chief Ved Prakash Malik, and many scholars, much of the background planning, including the construction of logistical supply routes, had been undertaken much earlier. On several occasions during the 1980s and 1990s, the army had given Pakistani leaders (Zia ul Haq and Benazir Bhutto) similar proposals for infiltration into the Kargil region, but the plans had been shelved for fear of drawing the nations into all-out war. Some analysts believe that the blueprint of attack was reactivated soon after Pervez Musharraf was appointed chief of army staff in October 1998. After the war, Nawaz Sharif, Prime Minister of Pakistan during the Kargil conflict, claimed that he was unaware of the plans and that he first learned about the situation when he received an urgent phone call from Atal Bihari Vajpayee, his counterpart in India. Sharif attributed the plan to Musharraf and "just two or three of his cronies", a view shared by some Pakistani writers who have stated that only four generals, including Musharraf, knew of the plan. Musharraf, however, asserted that Sharif had been briefed on the Kargil operation 15 days ahead of Vajpayee's journey to Lahore on 20 February.