BRUSSELS — The U.S. confirmed on Wednesday that it will reduce its troop presence on NATO’s borders with Ukraine but shed no light on any future cuts, as its allies worry about a security gap being created at a time when Russia is increasingly confrontational.

The news first came from Romania, whose defense minister said the decision reflects Washington’s shift “toward the Indo-Pacific” region. However, Ionut Mosteanu said allied troop numbers would remain above the number before Russia’s full-scale invasion of neighboring Ukraine in 2022.

The U.S. armed forces later confirmed the move, but denied it was a sign of lessened commitment to NATO. Analysts say it might tempt Russia to test the military alliance.

Depending on operations and exercises, around 80,000-100,000 U.S. troops are usu

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