I've read news reports that Russia threatens to attack US or NATO vehicles with armaments on Ukrainian territory. This surprised me on two counts, first that NATO vehicles would be making that part of the trip (if they do ...), and second that anyone could possibly think that such vehicles would be immune from attack within Ukrainian territory.
When weapons are shipped from NATO countries to Ukraine, are they carried across the border on military or government vehicles from NATO countries? If not, are they carried by commercial shippers or by Ukrainians?
What is the status of such a shipment under the laws of war, once it crosses the border? When does it become a military target? (Ignoring, for the question, the illegality of a war of aggression.)