I'd like to correct - Energia didn't have solid boosters; the four strap-ons were considered the first stage and burned LOX/kerosene in RD-170. RD-170 has 2 axi

I'd like to correct - Energia didn't have solid boosters; the four strap-ons were considered the first stage and burned LOX/kerosene in RD-170. RD-170 has 2 axis of thrust vectoring for each chamber, and RD-171 - the variant used in Zenit rockets - has 1 axis of thrust vectoring (the tangential one).