And fact remains that Russia does not want to lease Yasen let alone sell one
Akula yes, Yasen hell no
Imagine USA leasing Zumwalt, it would cost way more than USN paid for buying new one not that they would ever do it just like Russia and Yasen
Bad example but I agree... Zumwalt has all sorts of brand new technology and most of it does not work, which is why it is a dog, they would not lease it in fear the Russians or Chinese might get a look and steal some new ideas and actually get them to work as intended.... a bit like leasing the F-35 to China...
The markup on Russian weapons depends on the customer and the product, but as their MIC is government run money will go into investment and upgrades and research rather than CEOs private jets or holiday homes.
In the 1990s the Russians sold a few things to the west... Britain bought a Tunguska vehicle, the US bought an S-300V battery... obviously minus a lot of secret stuff... the USN bought the Kh-31 missile they used as a drone to test their navy CIWS defences with... they called it the MA-31 or something.
The money made... at a time when they weren't selling a lot to anyone went into developing Panstir and Antei-2500 and improvements in the rocket/ramjet design of the Kh-31 that soon lead to new models with double range and higher speed performance...
Once something is in production the risk of it being compromised increases massively so making money selling them that can be invested in upgrades and new replacements makes sense.
Having said that most Russian weapons and systems are evolutions of decades of experience of confrontations with HATO or operations in locations like Afghanistan or more recently Syria, with combat experience leading to changes and improvements.
Just paying enough for it to be made is selling themselves short, but most customers these days want local production or assembly, which of course massively jacks up the price anyway.
The Su-30MKI would be much much cheaper without the foreign parts added and made in Russia, but often the customer wants foreign parts added and to make it locally so the extra money goes to other foreign companies or wages for local people... for the best price get all parts from the vendor and have them make it.
Often other factors are more important like local jobs.