One problem they don't mention in the article is that Ukraine and the most of the rest of the former Soviet Union uses different rail track gauges. Which means

One problem they don't mention in the article is that Ukraine and the most of the rest of the former Soviet Union uses different rail track gauges. Which means that any trains must either stop to change wheelsets or the cargo must be unloaded and then and then loaded onto other trains. Russia uses trains a lot for logistics and has an advantage in moving heavy equipment to the front line. So that and the likelyhood of urban combat are probably the reason why most of the aid is composed of man portable weapons which contra the article are relatively easy to hide. The most vulnerable from the reported deliveries are the fuel and artillery ammo. I really hope a lot of that cargo is moved under the cover of night and doesn't stay in one place as it is vulnerable to missile attacks. They said that there are potentially Russian helicopters in the West of Ukraine, but that is probably not true and they are vulnerable to the MANPADs coming in from Poland and other places. Finally, there are Bayraktar drone deliveries from Turkey which are greatly appreciated.