You see, Russia is rather big country with good IADS. F-15E can't be used as a strategic bomber, because it have no chances to cross a front line.
No, not really.
Russia is not really a "big country with a good IADS". And for those unfamiliar with the term, that means an "Integrated Air Defense System". What they have is a strong wall built around Moscow, and that is about it actually. Because of the ABM limitations in SALT I, each country was allowed to maintain a limited number of those things. The Soviets kept their ring around Moscow, the US just decided to scrap their entire NIKE system.
However, we do still maintain at least one site as a museum however. If you are ever in the San Francisco area, check out SF-88. It is probably my favorite military related museum in the area, and is a fascinating place to visit. And there is a similar site in New Jersey that is still run as a museum.
And yes, the F-15 or any other aircraft can be used strategically or tactically. However, why you would use an air superiority fighter that was never designed to carry a nuke I have absolutely no idea. Even in the Cold War, we never developed such a weapon for that platform.
No, the main considered delivery system for tactical battlefield nukes by aircraft was the F-111, followed by the F-4, and then our various A class attack fighters. Yea, in theory a warhead like the B-61 could be attached to an F-15 or F-16, but why? The idea for that was simply the thought that by the time we needed one our attack aircraft might be depleted while we were fighting for air dominance, and the air superiority fighters might be all we had left.
However, aircraft like the F-111 and A series were great choices when you do not have air dominance because of their penetration abilities. Especially the F-111 "Aardvark", which had variable swept wings (like the B-1), and the theory at that time was that would allow it to fly lower and slower, allowing it to slip in past Warsaw Pact air defenses. Something a faster and hotter jet could not do.
It depends on it typical target, not only yield. For example, 21 kt "Fat Man" was a strategic bomb, because its target was a city, and 500 kt SS-N-19 "Shipwreck" is a tactical missile, because its typical targets are ships.
Not really, but in many cases yes.
Strategic is generally for use against "soft" targets. In other words, non-military civilian or industrial ones. Tactical are strikes against hard military targets. Troops, air bases, shipyards, and even ships at sea. You can use large or small weapons against any of those targets, but since the military likes to separate things like that, and the two really do not work well together. Nobody wants to consider throwing a 5MT warhead against a location they might have to then pass through during an assault, and the use of something of say 50kt against Moscow or New York would be almost insignificant so not worth the effort.
Now it could be argued that the two can cross, but it would depend on a great many things. And weapons like the Shipwreck and NIKe were always considered tactical was because of their intended targets. They were always intended as "area" targets, not used to take out a single target but a group of them. For Shipwreck it was an enemy fleet, for NIKE it was an enemy bomber group. Neither one was ever designed as any kind of ground attack weapon.
Sure, not. Russia have pretty much tactical nuclear warheads for Iskanders, artillery, anti-air and anti-ship missiles.
Which is the system that brought this entire form of madness back out of the bottle.
President Reagan fought so damned hard to get rid of things like that because they were freaking insane. One of the worst things that both sides did during the Cold War was to make platforms that could launch either a conventional or a nuclear payload. Because until the damned thing goes off, you never know which was launched at you. And that just increases the odds that one side will launch something conventional, and the other side in panic responds with one that is nuclear in response.
Hence, the decision to dump all of the land launched tactical missiles. In fact, the US went way beyond the scope of the INF treaty, primarily in the hopes of easing tensions with the Soviets. And now for some insane reason Russia wants to return to the "good old days".
But nuclear air defense systems and anti-ship weapons have no place in the modern military. Those were done at the time because none of them were accurate enough to actually guarantee a "contact hit" on the enemy. Soviet doctrine at the time of NIKE was to fly in groups of bombers against a target, and there were no air-defense missiles capable of even hitting bombers at that time. So our solution? Simple, just set off our own nuclear bomb as close as we could to the center of that bomber group. Hopefully eliminating them before they get within range.
The same with anti-ship missiles. Today they are much more accurate, can be fired out of visual sight of the target, and can be programmed to seek out specific classes of ships when located and target only them. No more need to launch a nuke in the hopes of sinking 1 or 2.