Naoya Ogawa
Ruska was a close friend to sambo world champion Chris Dolman, also a Bluming understudy. They had a falling out after Dolman joined Akira Maeda's Fighting Network Rings while Ruska was part of Antonio Inoki's New Japan Pro-Wrestling, but they mended it in September 1997, when Inoki visited Holland along with Naoya Ogawa. They stayed in contact until Ruska's death in 2015.