UPDATED COMMENT: Wikipedia says the 1967 attack on the U.S.S. Liberty was "a mistake due to Israeli confusion about the ship's identity," according to both U.S. and Israeli governments. (Though they also note people who question that conclusion...)
Edit: a more recent article mentions a budget of $730M:
https://www.timesofisrael.com/israel-just-quintupled-its-pr-...
https://www.timesofisrael.com/israel-just-quintupled-its-pr-...
Not sure if Russia, China and the others you mention spend more (totalled) than $730M?
I think the biggest issue with this conspiracy theory is why Israel would want to take out the liberty? It seems like the events would be strongly detrimental to Israeli interests. Nobody has really come up with a compelling motive, which suggests to me the most likely scenario is accident/miscommunication.