BY SADANAND DHUME

How should India respond to U.S.-led efforts to halt Iran's suspected rogue nuclear weapons program? An India that uses its oil purchases and diplomatic clout to create breathing room for Iran risks scuppering the notion New Delhi has benefited from for more than a decade: that India's rise is beneficial to the West. By contrast, should India throw its weight behind a powerful anti-Iran coalition, it stands to gain by halting the further nuclearization of its neighborhood, blunting the spread of radical Islam and bolstering its credentials as a force for stability.

You would think India would decisively choose the ...