Gallant told German counterpart Pistorius that the deal had "great significance for Israel and Germany from security, economic, and not least, symbolic perspectives."
Tally Gotliv's post drew immediate condemnations from the Prime Minister's Office, which called Gotliv's statements "infuriating."
Since 2007, Israel has had a Defense Export Control Law, which includes certain international standards for the control of arms sales. But what does it say?
"The ORON is the world’s most advanced aircraft of its kind," according to a statement by the ministry's Directorate of Defense Research and Development.
Israel for many years has bought weapons from Germany, and this is not the first sale of weapons there, but the price tag and sophistication of the defense system put it in a different league.
The Arrow 3 Missile defense system is designed to intercept exo-atmospheric ballistic missiles.
"Together with the chief of staff, I am working every day to find the way to unite everyone," the defense minister told new recruits at Tel Hashomer.