There's Leninsky prospect but no one would call it "улица Ленина" (which is a street that most of the post-Soviet cities and towns have, unlike Moscow). Just don't willingly believe every random thing that you find on the internet.
Same goes for the second tweet — so far I haven't seen any credible reports about the supposed ban and I've seen multiple official rebuttals from different avia companies. Can it happen? Sure. But random twitter accounts reposting any rumor that they come across isn't a good source of information.
edit: they don't need to restrict ticket sales since there are barely any left and the ones that are left cost an arm and a leg (in Shoigu's military compensations

).