“If the land route from Poland is cut off, Ukraine will have little to no ability to conduct military operations for more than a few months,” Davis wrote in an article for 19Fortyfive.

He noted that another way of delivering weapons through the Carpathians is more complicated and limited in terms of throughput.

According to him, a successful strike on supply lines will force the Ukrainian leadership to choose between negotiations and a crushing defeat.

Earlier, former CIA director David Petraeus said that a US-led multinational force could be involved in the conflict in Ukraine.