Donald Trump returned to the White House vowing always to put America first. In recent days, even longtime U.S. allies have found out the hard way that its friendship has limits.

Russia, which has rebuffed Trump's pleas for a ceasefire in Ukraine, apparently fired 17 drones that landed Wednesday in Poland — whose security is guaranteed by the U.S.-backed NATO alliance and whose president visited the White House the previous week.

A day earlier, Qatar — home to the largest U.S. air base in the Middle East and classified by Washington as a major non-NATO ally — saw Israel carry out airstrikes targeting Palestinian militants Hamas.