The US has distanced itself from an incursion into Russia – which Moscow says ended in the defeat of armed insurgents who entered from Ukraine.
Parts of the border region of Belgorod came under attack on Monday, in one of the largest cross-border raids since Russia invaded its neighbour last year.
Russia later released pictures of abandoned or damaged Western military vehicles, including US-made Humvees.
The US insisted it did not “encourage or enable strikes inside of Russia”.
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