As usual the western media likes to distort the facts far from the truth.
Russia was not threatening Poland.
Russia is telling Poland that by them allowing this that they are exposing themselves to attack by OTHER NATIONS whom have a gripe against These United States.
Suppose US went to war against Iran and Iran had nukes and wanted to launch one at a US city? Naturally they would attack Poland first and take out the defense mechanisms in place prior to launch against US soil.