The Club announcement actually lists the cohorts able to buy a Spartak ticket on Thirsday. There is a pecking order for the 675 tickets, and it goes all the way down to members with at least one home or away priority point. So basically, that's anyone who knows we usually play in blue.
The Club can't say what will be needed to travel, or indeed whether the permission for away fans to attend will not be revoked, because that depends on Putin, although they maybe should have put a link to the gov.uk website where the latest details are shown for what's required for international travel to various countries, and for returning home. As regards Russia, you need to get yourself to London, Edinburgh or Manchester to have your fingerprints biometrically scanned and pay a shed load of money for a visa which can take 20 or 30 days (I forget which) to come through. There is a one week (maybe shorter) "emergency" process for "essential business" but "going to watch a football match" is unlikely to cut it.
Unless there's folk who already hold the necessary travel paperwork, I'm struggling to see how ANYONE will be able to go.
But I'd not risk my neck there anyway.