could it be part of this booster rocket ?

https://files.catbox.moe/xikvlc.jpg

btw this one is S-200 (not 300) and yes it is part of the Ukrainian anti-air (everything on the pic is Ukrainian.. note the sign on fighter jet) and also it is fired from static GROUND platform... clearly a booster would not reach that far from Russian teritory.

edit: thinking about it now, maybe im stupid and dont know how this missiles are suppose to operate

"Each missile is launched by 4 solid-fueled strap-on rocket boosters.[7] After they burn out and drop away (between 3 and 5.1 seconds from launch)" https://en.wikipedia.org/wiki/S-200_(missile)

could it be part of this booster rocket ?

https://files.catbox.moe/xikvlc.jpg

btw this one is S-200 (not 300) and yes it is part of the Ukrainian anti-air (everything on the pic is Ukrainian.. note the sign on fighter jet) and also it is fired from static GROUND platform... clearly a booster would not reach that far from Russian teritory.

edit: thinking about it now, maybe im stupid and dont know how this missiles are suppose to operate