NEW DELHI — Steep U.S. tariffs on a range of Indian products took effect Wednesday, threatening a serious blow to India’s overseas trade in its largest export market.

President Donald Trump had initially announced a 25% tariff on Indian goods. But earlier this month he signed an executive order imposing an additional 25% tariff due to India’s purchases of Russian oil , bringing the combined tariffs imposed by the U.S. on its ally to 50%.

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