Watch: Why a Russian strike on train near Ukraine-Poland border could mark an escalation

A Russian drone struck a train near the Ukraine-Poland border. The incident occurred shortly after Boris Johnson and other European officials had departed the vicinity. Fortunately, no casualties were reported as a result of the strike. The article suggests this event could signify an escalation in the conflict. The specific reasons for the strike or its broader implications beyond a potential escalation are not detailed in the provided content.