From Wiki
Border checkpoints between Slovakia and Ukraine
Road
Uzhorod ( Ukraine ) -the Slovakian checkpoint is a village of 250 inhabitants : only motorized traffic,thus no place for foot infantry
Mali-Bereznyi (Ukraine ) - Ubla (Slovakia ) only for vehicles with a weight lower than 3,5 tons . Thus not usable
Rail
Pavlone-(Ukraine )Mat'ovce (Slovakia ) - freight only ,thus no military personnel
Chop (Ukraine) has only two platforms -Cierna nad tisou (Slovakia )
About tanks and artillery :Ukraine needs thousands of them ,but the US Air Force can not transport thousands of tanks,artillery and their spare parts and ammunition . And when they arrive at the airports (if these are still operational ) they are still not at the front and to go ,example from Kiev to Mariupol,they must be transported by rail .
Besides : are there any reliable figures of the number of US aircraft that were going to Ukrainian airfield during this war,risking to be destroyed and what was their loading ?
For the checkpoints : there is one by road for motorized traffic only and by rail there is also only one for freight only .
This means that the thousands of Ukrainian military who had their instruction in UK could return to Ukraine only through Poland .They can not go from Poland to Romania, unless Hungary admits their passage .
And about Romania : its support to Ukraine is not without limits : the Romanian foreign minister pleaded for a more neutral policy,and he is sill minister of foreign affairs .