I see no signs of brotherly love on the part of Western countries towards each other or towards anyone else.
As for keeping Ukraine in the Russian sphere of influence, this influence, unfortunately, was only economic. Basically, it consisted in the fact that the main foreign trade of Ukraine was focused on Russia. It seemed to our politicians that this in itself guarantees the impossibility of Ukraine's "withdrawal" from Russia. Unfortunately, Russia did not interfere in domestic politics until it received an anti-Russian coup d'état initiated by the West and the threat of NATO forces appearing at its borders. We overestimated the pragmatism of the Ukrainian oligarchs.
The example with K-202 is a distortion of facts by you. This situation became possible not because there was a bad "Mongolian" USSR (unlike the good USA and England), but because there was a bipolar world, and from the western side it was not more teleactive to the opponent. If Bill Gates suddenly wanted to cooperate with the USSR, he would hardly have received at least a dollar from the American state for his project.