Kawaii? Not a term I’m familiar with.
On the US and Russian versions, is the supersonic capability only meant to increase the vulnerability window when exposed to AA weapons and get out of its engagement envelope faster? I can’t think of many other sensible uses of supersonic bombers but perhaps you can. …
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Fighter interceptor tactics depend on the fighter being significantly faster than the bomber. A fighter with a Mach 0.9 cruise and M1.5 dash can readily defend a large area against M0.7 bombers. Have the bombers be able to cruise long-term at M1.5 and suddenly the fighters’ defensible area shrinks drastically. So now the defender needs 3 or 4x as many fighters and bases to defend the same perimeter. As well, a successful intercept relies on getting out in front of the incoming bomber then timing a turn around to end up nearby goingthe same direction and speed. The fighter pilot fixes any mistakes in the set up or timing using his superior speed. If he doesn’t have superior speed, then any slight mistake or non-optimal setup results in him watching the bomber sailing serenely on to its target with the fighter trailing haplessly behind just out of weapons range. If the bomber can really dash then by careful use of maneuver & speed the bomber can pretty well ensure every fighter will “miss the intercept” if the bomber knows (via ESM or EO sensor) that he’s targeted.
Speed also complicates the attack problem for SAMs & AAA by shrinking the warning & engagement envelopes, but not to the same degree as it hits fighters.
Speed also strains the defender’s C[sup]3[/sup] systems. (Made up numbers ahead) With an incoming Bull Tupolev Tu-4 - Wikipedia, we’d have, say, 2 hours from first detection to weapons release. For a Bear, make it 45 minutes. For a Blackjack or Backfire it’s more like 20 minutes. To detect, track, fuse, decide, select counter forces, alert those forces and launch them all takes time.
Stealth? None. EW? I have no knowledge. A typical combat bomber would have jamming for search & track radars, RWR to know whether it’s targeted, and maybe ESM recorders for intel purposes. A peacetime probing bomber would for sure have ESM recorders, and would not exercise its jammers.
Russia is said to be just starting to come out with some very advanced EW gear. The odds on that being integrated into the elderly TU-160 fleet is very small IMO.
Russia, China, and the US, as well as lots of other countries run intel aircraft & probing flights along airspace borders and have since WWII ended. At various times the volume and edginess of the encounters has waxed and waned. The same thing is done with naval ships.
After some nasty incidents in the mid-60s a treaty was agreed on some basic rules of the road. Incidents at Sea Agreement . There’s a corresponding set of side agreements applying to aviation. Everybody wanted to probe the opposition and poke them in the ribs a little bit, but everybody also wanted to avoid an inadvertent live fire incident that might back the other side into two-tits-for-tat escalation.
As of today the Chinese are having problems restraining some of their vessels and aircrew. As best I’ve read in open sources, the current Russian stuff is well-disciplined.
A separate matter to the military-to-military encounters is the inherent danger all this shenanigans poses to civil aviation. And in this I understand the Russian leadership are currently being downright reckless. The frequency, routing, and duration of these missions are decided at a pretty high level; the crews just go fly as ordered. And this high level is intent on demonstrating that the Russian government and/or military simply do not care about any civil considerations. They’re just being Klingons about the whole thing.