As for preciseness, the newer ballistics have precision of over 90% (thanks, US designed chips). Older ones probably 75%. Their biggest weakness is access to chips.
And the imprecise hits are coming from the Tochka-Us, an old system that mostly the Ukrainians are fielding - but maybe pro-Russian Ukrainian separatists forces some, too.
Check out this book: https://www.amazon.com/Losing-Military-Supremacy-American-St...
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