I understand "interested" is quite a vague way of phrasing it. I just imagined it would've been beneficial for the Soviet Union if the conflict continued or even became more intense as this would mean that Britain had less resources to use in a potential war between NATO and the Warsaw Pact. If not, is there any Soviet politicians or people of importance in some form or another that talked about the conflict and what were their views? I thought of this question after reading a 2013 article by the scotsman claiming that the Soviet Union ‘was ready to exploit IRA’ in Cold War
Hmm, there is very little official information available on this as it relates to Soviet overseas intelligence. The first place I would look would be the Mitrokin Archive, which is the collected debrief of a Soviet intelligence agent in the later Cold War, but I cannot remember in my reading anything on this.
I do know that the IRA was able by the early 1980s to get access to Soviet Bloc weapons and explosives through Libya, as the PIRA's support from the US was in decline by that point, I don't however know whether this was on the initiative of Ghadaffi or if Libya was the final stop in an (Moscow) authorised pipeline.
According to Eunan O'Halpin in Defending Ireland: the Irish state and its enemies since 1922 the Soviet Union kept clear of the Provisional IRA. They did support the political activity of the Official IRA which was more ideological sympathetic. The Libyan arms shipments were direct support from Gaddafi rather than the USSR.