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One of the United States’ most important strategic partners in Southeast Asia—Singapore—is beginning to lose faith in the Trump administration. U.S. President Donald Trump’s tariffs, coupled with the acute energy crisis caused by his war against Iran and U.S. government pressure to force Singapore into even closer alignment, have severely frustrated Singaporean leaders. As Singapore seeks a stable place in an increasingly disorderly international system, this could result in a more diversified Singaporean foreign policy, including a more prominent role for China.

Alienating Singapore would be an unforced error—and perhaps a significant one. The city-state sits on a small island strategically located on the vital Strait of Malacca that connects the Indian and Pacific oceans, and it serves as a de facto security ally of the United States. Singapore hosts and maintains U.S. warships at its Changi Naval Base and participates in a range of other military agreements, making it a potentially critical node of support to U.S. military forces defending Taiwan or addressing any number of other future contingencies throughout the Indo-Pacific. Singapore is also a firm supporter of the rules-based international order, which has allowed it to benefit from both free and open trade.

One of the United States’ most important strategic partners in Southeast Asia—Singapore—is beginning to lose faith in the Trump administration. U.S. President Donald Trump’s tariffs, coupled with the acute energy crisis caused by his war against Iran and U.S. government pressure to force Singapore into even closer alignment, have severely frustrated Singaporean leaders. As Singapore seeks a stable place in an increasingly disorderly international system, this could result in a more diversified Singaporean foreign policy, including a more prominent role for China.

Alienating Singapore would be an unforced error—and perhaps a significant one. The city-state sits on a small island strategically located on the vital Strait of Malacca that connects the Indian and Pacific oceans, and it serves as a de facto security ally of the United States. Singapore hosts and maintains U.S. warships at its Changi Naval Base and participates in a range of other........

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