Donald Trump said incursions by Russian drones into Polish airspace 'could have been a mistake' but stressed that he was 'not happy' by the incident that was condemned by NATO and its allies.
Poland on Wednesday shot down what it said were Russian drones that violated its airspace.
Warsaw was backed by its NATO allies in taking down the devices - the first time a member of the military alliance is known to have fired shots during Russia's war in Ukraine.
Russia said it had not intended to hit any targets in Poland, and that it would make no further comment on the incident, while senior NATO commander said it was not yet known whether the drone incursions were intentional.
'It could have been a mistake, but regardless I'm not happy about anything having to do with that whole situation,' Trump told reporters on Thursday outside the White House.
