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The India-Pakistan relationship is facing the most serious escalation in decades. Here’s how it got to this point.

Indian army soldiers patrol near the Line of Control in Nowshera sector, about 56 miles from Jammu, India, on Oct. 2, 2016. (Channi Anand/AP)

India launched an airstrike on a target in Pakistan on Tuesday, the most serious escalation in hostilities between the two countries in decades.

According to Indian officials, the strike’s target was the training camp of a Pakistan-based militant group that had claimed responsibility for a massive suicide bombing in Indian-controlled Kashmir on Feb. 14.

The nuclear-armed neighbors have a long history of animosity. The main, ongoing source of conflict is Kashmir, a Himalayan border region whose status has been contested ever since India gained independence and Pakistan was created in the partition of British India.

Since then, the two countries have fought three brief wars — in 1947, 1965 and 1971 — as well as a smaller conflict in 1999. Over the past two decades, there also have been numerous attempts at rapprochement: At one point, secret talks reportedly neared a final resolution on Kashmir.

On Feb. 15, Indian Prime Minister Narendra Modi accused Pakistan of playing a role in the bombing that left at least 40 paramilitary officers dead in Kashmir. (Video: Associated Press)

Now, with the Feb. 14 attack and India’s retaliatory strike, tensions are once again on the rise. For India, the Kashmir attack is part of a longer pattern in which Pakistan’s intelligence services have fostered and guided militant groups that carry out deadly attacks throughout India. Pakistan, meanwhile, views its far larger neighbor as an occupying power in Kashmir that also seeks to undermine Pakistan’s stability. Pakistan denies supporting terrorism but says it gives political and moral support to Kashmiri “freedom fighters.”

Here is a selection of recent highs and lows — although mostly lows — in their tense relationship.

1989: The insurgency in Kashmir begins

The dispute over Kashmir is as old as India and Pakistan. India controls the larger and more developed chunk of the Himalayan region, which forms its only Muslim-majority state. In 1987, legislative elections were held in Indian-controlled Kashmir, but Kashmiri Muslims protested that the polls were rigged. Two years later, an armed insurgency erupted in the region, along with mass protests. The militancy against Indian rule has continued, with ebbs and flows, ever since. More than 70,000 people have been killed, according to human rights groups.

1999: A bus trip raises hopes for reconciliation

In 1998, India and Pakistan both tested nuclear devices, marking a fundamental shift in the strategic balance in South Asia. The next year, Indian Prime Minister Atal Bihari Vajpayee traveled by bus to Pakistan across the only official border opening in a gesture of friendship. He and Pakistani Prime Minister Nawaz Sharif pledged to resolve their differences through dialogue.

1999: The Kargil conflict breaks out

Before the year was out, hopes for reconciliation were dashed. After months of cross-border firing in the mountainous Kargil region of Kashmir, the fighting escalated dangerously, with infiltrators from the Pakistani side crossing into high-altitude security posts in India. This time, the specter of nuclear war hung over the dispute. A meeting between Sharif and President Bill Clinton in Washington helped end the fighting, and Pakistan withdrew back to the Line of Control, but mutual hostility remained intense.

2001: Gunmen storm India’s Parliament

In December, five militants attacked India’s Parliament in the heart of New Delhi, killing nine people before the attackers were shot dead. The brazenness of the attack — in the most secure area of the capital, on a target symbolizing Indian democracy — left India shaken and enraged. India blamed the attack on two Pakistan-based militant groups, Lashkar-e-Taiba and Jaish-e-Muhammad, and accused the Pakistani intelligence service of being behind the operation. India massed hundreds of thousands of troops at the border with Pakistan and kept them there for the better part of a year.

2004: Leaders begin a peace initiative

After the attack on India’s Parliament, the relationship between India and Pakistan entered a deep freeze. But by late 2003, the atmosphere began to thaw: Top diplomats returned to Islamabad and New Delhi, and transportation links between the two countries were reinstated. Most promising of all: an agreement by Vajpayee and Pakistani President Pervez Musharraf to open talks on all issues, including Kashmir. The talks continued for three years.

2008: Terrorists strike Mumbai

In November, 10 attackers approached India’s financial capital by sea and targeted a railway station, two luxury hotels, a renowned cafe and a Jewish community center. By the time their three-day massacre was over, more than 160 people were dead. India presented Pakistan with a dossier showing that the attacks were planned and carried out by Lashkar-e-Taiba. India also said Pakistan’s spy agency helped orchestrate the attacks. Last year, devotees of Lashkar’s former leader ran for parliament in Pakistan’s elections.

2016: India launches “surgical strikes” across the line dividing Kashmir

After militants belonging to a Pakistan-based militant group stormed an Indian army base in Kashmir, killing 19 soldiers, Indian Prime Minister Narendra Modi promised to respond. India announced that it had launched “surgical strikes” in Pakistani-controlled Kashmir — commando raids that crossed the Line of Control. Indian experts said similar raids had been conducted before but never made public. Pakistan said no such incursions took place.

2019: Pakistan-based group carries out deadliest attack of 30-year Kashmir insurgency — and India retaliates

On Feb. 14, a suicide attacker rammed an explosives-laden sport-utility vehicle into a convoy of Indian paramilitary police, killing 40. The attacker was a local Kashmiri teenager who had joined Jaish-e-Muhammad, a Pakistan-based militant group that the United States designated as a terrorist organization in 2001. Modi vowed to “avenge every tear” that was shed in the wake of the bombing. Pakistani Prime Minister Imran Khan said the country would take action against anyone involved in the attack “if evidence is found.” He also vowed to retaliate if India responded to the attack with military action against Pakistani targets.

But India did not heed Khan’s warning. In the most serious escalation between the two countries in two decades, Indian fighter jets crossed the Line of Control, and hit a target that, according to India, was a training camp used by Jaish-e-Muhammad. India called its strike a “nonmilitary strike,” as it was not aimed at Pakistani military targets, and said it was taking “preemptive” action against Jaish-e-Muhammad.

Indian Foreign Secretary Vijay Gokhale said that the strike was based on “credible intelligence” that the group was planning another attack and that it “eliminated” a “large number” of militants. Asif Ghafoor, the spokesman for Pakistani armed forces, said that the strike caused no casualties or damage and that the fighter jets released their “payload in haste while escaping” from Pakistani aircraft. India had not sent fighter jets across the Line of Control since 1971.

In the deadliest attack in the region in three decades, a suicide bomber killed at least 40 people in India-controlled Kashmir on Feb. 14. (Video: Associated Press)

Emily Tamkin in Washington contributed to this report.