Last Oct I did a brief summary of the depth of Sater's 5k1 letter from 2009. I don't often hear anyone referencing Leslie Caldwell's sentencing memorandum regarding Felix, either. Let's quickly cover highlights.
https://www.documentcloud.org/documents/6328605-Felix-Sater-Leslie-Caldewell-Defense-Sentencing.html
/thread https://twitter.com/supersleuthgrl/status/1183981603405651968

"Felix was more than simply honest and forthcoming - he was proactive and in fact RISKED HIS LIFE NUMEROUS TIMES in ways not normally seen in the criminal justice system."
"gathered sensitive Russian military intelligence data"

"met with Russian criminals in Cyprus and Turkey"
"helped the FBI to attain a greater level of understanding of various sophisticated fraud schemes"
"Felix has worked steadily in several lawful businesses in the United States and Russia"

"prosecutors and FBI agents had sufficient trust in Felix that they found it unnecessary to impose any travel restrictions or pre-trial reporting requirements"
"Felix was able to enter covertly a closed Russian military installation, where he located the missile system"

Why stop there when you're 007? Let's just head back to Central Asia and get intel on North Korea's nuclear program, shall we? Check that off the list.
Bin Laden's phone numbers.
Steady stream of details re: Bin Laden/Al Qaeda.
Secret meetings.
Sudanese banks.

Want the names of Al Qaeda members? Got it.
Want to know the locations of their weapons? Cool.
Oh, you want to know who was involved with the 1998 and 2000 attacks? Alright.

Here, hold my beer.

Think you're going to assassinate W. Bush or Cheney, or even Colin Powell when Felix Sater's around?
- Not likely -

Shady international money laundering networks?
Sure, no sweat, FBI. Is that beer still cold?

What's that? Sater feeding intel on Russian organized crime?! (nope. nothing to see here.)
"Between 1998 -2008, Felix was under the continuous supervision of FBI agents with whom he worked closely"
"each of those agents considered Felix's work with them to be exemplary"
/end