I found Stone’s book convincing.
You know Stone was outed as a KGB agent, right?
Anyways, Pacepa, having been involved in the creation of Operation Dragon, made it VERY clear that the Soviets were definitely involved:
*https://pjmedia.com/mihaipacepa/2013/11/20/the-new-proof-of-the-kgbs-hand-in-jfks-assassination/
*http://www.wnd.com/2013/11/evidence-shows-kgbs-hand-in-jfk-assassination/
*https://pjmedia.com/lifestyle/2013/11/20/11-facts-that-destroy-jfk-conspiracy-theories-part-one/
*https://pjmedia.com/lifestyle/2013/11/20/11-facts-that-destroy-jfk-conspiracy-theories-part-two/
*https://pjmedia.com/lifestyle/2013/11/20/11-facts-that-destroy-jfk-conspiracy-theories-part-three/
[i] Stan Weber, A New Paradigmatic Work on the JFK Assassination, H-Net Online, October 2009, http://www.h-net.org/reviews/showrev.php?id=25348
[ii] Barry Renfrew, Boris Yeltsin Resigns, The Washington Post, December 31, 1999, 6:48 a.m.
[iii] Matt Drudge Report, December 31, 1999, 11:00 AM UTC.
[iv] Ariel Cohen, End of the Yeltsin Era, The Washington Times, January 3, 2000, Internet Edition, cohen-20000103.
*http://www.conservapedia.com/Lee_Harvey_Oswald