The Mumbai attacks may have begun with Lashkar-e-Taiba, a Pakistani guerrilla group known in the West mostly for its preoccupation with Kashmir. But by the time the crisis finally ends, foreign policy experts say, the fallout may have expanded to include the United States, NATO, Afghanistan and Iran.Once again, South Asia is showing itself to be vulnerable to contagion. President-elect Barack Obama during the campaign laid out an intricate construction for what might happen in South Asia with the right American push. He advocated increasing American troops in Afghanistan and pressing Pakistan to do more to evict foreign fighters and to attack training camps for radical terrorists along the Afghanistan-Pakistan border.Strategically, the Mumbai massacres have brought into stark relief just how tenuous are American hopes for any kind of calm in Pakistan and Afghanistan, let alone victory over militant forces in the region. “Step back and consider the situation the Mumbai attackers have created,” said George Friedman, chief executive of Stratfor, a geopolitical risk analysis company. Friedman laid out a frightening domino theory of possible repercussions of Mumbai. Warning: it gets scary fast.• India’s already weak government decides it has to retaliate against Pakistan or risk falling. India didn’t retaliate after the deadly bombing of the Indian embassy in Kabul July 7. But many Indians view the Mumbai attacks the same way Americans viewed the September 11, 2001, attacks, and the Indian government is under enormous pressure to retaliate, perhaps by bombing training camps in Pakistan. Seven years ago, the attack on India’s Parliament led to an intense crisis between the two nations. Since then, the Indian government has been more restrained. But you can’t expect that restraint to dissolve were a firm link between the Mumbai attack and Pakistan’s intelligence service to emerge.• Pakistan responds by withdrawing forces from western Pakistan, where they can fight Al Qaeda and the Taliban, to the India-Pakistan border.Pakistan security officials have already warned that if the situation with India worsens, they will shift troops from western areas, and pointedly noted during a news conference that such a step would likely upset the United States because it would mean resources were being moved from the fight against Islamic militants along the Afghan border. • Taliban forces, freed from having to watch out for Pakistani troops, are strengthened along the Afghan border; Qaeda operatives are more secure. • The United States’ situation in Afghanistan goes from bad to worse.• Iran, watching Pakistan and India rattling their nuclear sabers, concludes that it is in a better position to insist on pursuing its nuclear programme. The Mumbai attacks, said Friedman, of Stratfor, “could leave Obama’s entire South Asia strategy in shambles.