I've heard that Moskow Diskow was meant to be the A-side (and was in other countries), but someone somewhere decided that the B-side would get more attention from radio in the UK. Can Buzby confirm / deny?
On their French label Disques Vogue (they were nominally signed to RKM in Belgium, but Vogue did most of their promotion), Moscow Discow was issued as the second single from their debut album Looking For Saint Tropez, with a different B-side.

Rock Around The Clock was released as the follow-up. Their debut single was
Twist A Saint TropezIn the UK, their licensor Sire followed suit. They issued Twist A Saint Tropez first in November 1978, but it did not chart. They then issued Moscow Disco as the second single in April 1979, but replaced the B-side from the Vogue release with the previous A-side Twist A Saint Tropez.

This single also did not chart, Sire then issued Rock Around The Clock as the third single in June 1979, and again replaced the Vogue B-side with the previous A-side Moscow Disco. This finally became a minor hit, reaching #34 in August (the UK 12" version of Rock Around The Clock was remixed by Pete Waterman).
I dunno about inventing trance though, it was pretty obviously 'inspired' by Kraftwerk's Trans Europe Express, released the previous year.