President Trump’s decision to slap secondary sanctions on India over its imports of Russian oil, while also unleashing a tariff barrage on Indian exports, is more than a trade dispute. It is a self-inflicted wound to America’s most vital strategic partnership in Asia, and it comes at a time when China is flexing its military muscle throughout the region.

Washington has long courted India as a bulwark against an expansionist China and as a critical pillar of its “free and open Indo-Pacific” strategy. Yet Trump’s punitive steps against India are eroding the very trust on which strategic alignment rests — to Beijing’s delight.

The mutual trust painstakingly built over years underpins bilateral cooperation. Once lost, it will be hard to rebuild. Even if the administration eventually reaches a trade deal with India, it may not be able to repair the damage.

Targeting India over Russian oil purchases smacks of selective enforcement. The European Union’s large imports of Russian energy products, especially liquefied natural gas, have been left untouched. Such European imports not only contribute more to Russia’s coffers than India’s purchases, but Europe spends more on Russian energy than on assisting Ukraine.

Trump has also spared the world’s largest buyer of Russian oil and gas: China. But India, the very country........

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