Fialka was known as a more complex version of the Enigma, created by Russian military for communicating within the Soviet Union and Warsaw pact in the 1960s- early 1970s. Compared to the Enigma's three rotors, Fialka had ten rotors- giving way to approximately 8.6e50 configurations. When a Fialka machine was captured in 1967, the NSA built a computer to decrypt messages.
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Russia, “Fialka,” Ciphers and Encryption, accessed May 19, 2022, https://crypto.omeka.net/items/show/7.