This could be a blooming mess for UEFA if Russia get booted. Sure it might be auto qualification for us, but then who takes our spot in the ploy off as League C winners - Norway, thankfully that game is home advantage already but then they would a random team's instead of us - but come December, Serbia fans have already bought travel, who reimburses that? Travel insurance MAYBE or your out of pocket, then it likely doesn't just have an impact on League C, but definitely B and maybe even up to A.
UEFA would bottle this and really who can blame them, the only thing that can stop this is issue an advisory before Friday and advise fans that fixtures would be reviewed in late December pending a review from WADA, then you might have law suits from Russia saying where is our day in court, they are presumed guilty.
I cant see UEFA making any ruling against Russia for EURO 2020 but rather the World Cup campaign if this touched football at all.