Why Putin won't use Nukes......

Won't use nukes on whom? The Ukraine doesn't make sense, as Russia needs the Ukraine to continue their offensive to Poland, Romania, etc. The Ukraine is not the goal, just a stepping stone.

On the west/US? If Nato attacks Russia, all bets are off. Things go nuclear very easily from there. This is why the west should have kept their word and not recruited countries like Poland into Nato. This was a treaty of Versaille level move. Stupid from a European peace perspective. Of course, that was never the impetus... Just like Versaille.

because Ukraine has always been part of Russia?

a.k.a. 'Little Russia'

end game is when NATO stops f*cking with Russia

The USA response would be conventional, but would hit every infrastructure system in Russia including water, power generation, power transmission, telecom, refining, computer centers, pipelines, and all forms of storage. Rails, bridges, dams, canals, harbors are high on the target list. As a side note the US attack on the Hiroshima civilian target was a war crime. The fleet anchorage comparable to Newpor Roads and San Diego combined for Japan was just a couple miles away. we intentionally targeted for maximum civilian death. The two remaining anchorages for the whole Japanese navy were within just a few thousand feet. They were avoided--"Peculiar features of the Kure Naval Base were the Naval College, the Submarine School and its huge Naval Yard. I will provide details about the Naval College in a separate report but will outline it here. The Naval College was situated on Etajima, the island opposite Kure, and there was no establishment except the college. Its environment was calm and excellent, and its effect upon the cadets was so remarkable that we cannot neglect it in analyzing Japanese naval tradition.

The width and depth of Hiroshima Bay was so suitable for small-craft maneuvering that the Japanese Navy trained it submarine forces there from the beginning. The Submarine School trained all of the crews of the midget submarines of the type that were deployed in the Pearl Harbor attack, and would have later been deployed in large numbers to defend the homeland.

The Kure Naval Yard was not only the greatest dockyard in Japan, but also the largest arsenal, especially in such heavy industries as the manufacture of steel armor plates and large-caliber guns. The Kure arsenal produced the thickest armor ever made in Japan, and the greatest (18-inch) naval guns ever made, both of which armed the Yamato and the Musashi, the greatest battleships ever made.

Moreover, Kure Naval Base held a substantial portion of the war stocks of ammunition and fuel. Kure was in both reputation and fact the most important naval base in the country.

In addition, it had other particular advantages that Yokosuka and Sasebo both lacked.

1. Kure could accommodate a large fleet, but neighboring Hiroshima Bay also allowed dispersed anchorages that were not so exposed to public view.

2. Its Inland Sea location made Kure less accessible to direct attack by enemy carrier-borne aircraft than Yokosuka and other bases were.

3. The large expanse (Suō-nada) in the western part of the Inland Sea near Hiroshima Bay was the only area where large fleets could maneuver without fear of enemy submarines.

Consequently, Kure Naval Base had been used as a center for fleet operations from the beginning of the Pacific War until the spring of 1945, when Admiral Halsey's Third Fleet annihilated the remainder of the Japanese fleet in Hiroshima Bay."