Just got this mail. Important info
Dear spectators of the 2018 FIFA World Cup™!
FAN ID holders entering the Russian Federation territory in the period from the 4th of June to the 15th of July and exiting the Russian Federation territory from
the 4th of June to the 25th of July 2018 have the right of visa-free transit through the territory of the Republic of Belarus with FAN ID both on a laminated form and in electronic form and a valid identity document (passport) in the period from the 4th of June to the 25th of July 2018.
More details on the Russian and Belarusian State borders crossing you can find on the Ministry of Foreign Affairs of the Russian Federation official website following the link:
Sir i want to go to kaliningard. I have russia visa only.
Yes, I confirm: I entered Kaliningrad two years before with a normal tourist visa for Russia, fliying directly from Moscow to Kaliningrad - no passport control after landing in Kaliningrad as it is a domestic flight as if you would fly from Moscow to Peterburg.
In any case, in your visa-application, you are asked which regions of Russia you intend to visit, so that's maybe the confusion with (not existing) "Kaliningrad visa". However, visa are issued for Russia, not for single regions. Don't know if the regions you indicate in your visa application has any practical importance at all.