Upvote:4
I'm from Turkey and I don't think you should be worried about anything..
First of all, if anyone missed the situation, Russian and Turkish governments have some political crisis since Russian Sukhoi Su-24 shoot down in 2015. And since 1 January 2016, Russia's visa-free travel with Turkey was suspended.
I agreed with Zach. If your plan is transferring to another plane over Turkey to London, you should not be worried about anything. AFAIK, Turkish government doesn't applied any sanction for Russian passports or Russian people for this situation.
But if you plan is visiting the Turkey, visa is re-required like before 12 May 2010.