Why could the Soviet Union not fire on the planes flying into West Berlin?

Firing on the planes would have been considered an act of war.

Explanation:

hope this helps

Explanation:

Because one side of West Berlin did not have a supply of food and supplies for 21 days so President Truman had to airlift supplies to them which made the Soviet Union back down once West Berlin was having European goods sold.

the enslaved people onboard suffered from illness with some frequency

b) the confederacy had to pay all union war expenses.