Our friends at Rorate have the news… which I read twice to be sure…
The next ‘approved’ Traditional Latin Mass will be on May 31 (Pentecost), but usually it is offered every 1st Sunday of the month, at 1700 H (5:00 P.M.) in the basement chapel of the Cathedral (of the Immaculate Conception, Moscow).
The priest who offers the Mass is Fr. Augustyn Dziedziel SDB. Catholic guests of Moscow are most welcome. (Father also speaks some English in addition to Polish and Russian, so confessions are possible before Mass.)
I think Satan might particularly hate this one.