Russia does it to NATO airspace all the time, its just little bit of tit for tat
Indeed, a few years ago a pair of Tu-160s performed a mock attack run on Hull (which kind of tells you all you need to know about the quality of Russia's battlefield intelligence lol), it raised quite a few eyebrows at the time as the got in firing range and the RAF didn't even pick them up until they turned for home.
However this sort of thing is nowhere near the levels it was during the cold war simply because Russia don't have the USSR's budget and can't operate as many planes.
To put it in perspective, the Soviet air force had in operational service at the time of it's collapse: 700+ Tu-16 Badger bombers, 500+ Yak-28 Brewer bombers, ~300 Tu-22 Blinder bombers, 100+ M-4 Bison bombers, 300+ Tu-95 Bear bombers, ~500 Tu-22M Backfire bombers and ~16 Tu-160 Blackjack bombers.
The Russian Air and Space forces currently have in operational service: 0 Tu-16 Badger bombers, 0 Yak-28 Brewer bombers, 0 Tu-22 Blinder bombers, 0 M-4 Bison bombers, ~42 Tu-95 Bear bombers, ~67 Tu-22M Backfire bombers and ~16 Tu-160 Blackjack bombers. Now granted some of the planes went to Ukraine/Belarus/etc during the USSRs breakup but Russia got by far the lions share (and was even given some of Ukraine's share for signing the Budapest memorandum).
By comparison to the USA, they have also scaled down the amount of bombers they keep in service these days (though they had far less to start with due to the USSR focusing on maintaining a "bomber gap"), but they have 74 B-52s compared to Russia's 42 Bears, they have 45 B-1s compared to Russia's 67 Backfires (I actually expected the USA to have the numerical advantage here lol), and they have 18 B-2s compared to Russia's 16 Tu-160s.