EUTERS/Alexander ErmochenkoPoland is deploying combat helicopters and increasing troop levels at its border with Belarus in response to what Warsaw claims was a violation of its airspace this week.Poland’s Ministry of Defense said that two Belarusian helicopters training near the border violated Polish airspace in the eastern Bialowieza region. The U.S. Department of Defense characterized the incident as an “incursion into Polish airspace by Belarusian aircraft” in a statement Friday.Polish troo