[FPSPACE] Proton M article

[Chris Jones]

JamesOberg@aol.com writes:

  Much of this disadvantage can be erased by using a lunar swing-by, and the 
  Russians have long been interested in this option, both for Baykonur and for 
  Plesetsk. FREGAT and BRIZ make these long trip times feasible -- I expect to 
  hear more about it from Russia shortly.

Is it because they have longer lives than Blok D-style stages?  (I assume
Fregat's life is real long, given it basically went to Mars and worked when it
got there.  I see the Briz family also uses storable (non-cryogenic)
propellants.)