The US is expanding NATO “geographically” to reach the borders of Russia because it is simply planning to deprive the Russians of their ballistic capabilities from the fixed bases on the Russian land..
When the US missile shield is installed in Ukraine, Poland, Sweden and Finland, it can can easily hit any Russian missile in the 1st stage, which is the ascent stage of the ballistic missile, or at most at the beginning of the 2nd stage. The ballistic transition stage.. In these stages, the interception success rate exceeds 95% Estimated due to the weakness of the missile in terms of acceleration or ability to move away from the lower orbit of the Earth, as does a missile such as Satan I or the new Sarmat (Satan II), where it departs from the lower orbit of the Earth and heads to the poles of the Earth, from which it is inferred on the target and revolves around the pole of the Earth until it reaches directly above it...
This is a simplified explanation of the importance of the geographical expansion of NATO to the proximity to Russia..
On the other hand.. It is very clear that the Russian ballistic missiles constitute a great source of concern for the US and the EU, because of which all the past years were invested in forming and expanding the NATO alliance in order to neutralize this danger or at least reduce it.
It mean that despite its large bases in Europe and its proximity to the borders of Russia, the US still does not feel completely safe.. and for a good reason beyond its capabilities; The area of Russia is more than 17 million km. The Russians can simply rely on the bases in the city of Yekaterinburg, which is tens of thousands of kilometers from the European borders, or even the Ural region in central Russia.
Russia is not the size of France or Britain, because its area is very large, and it can launch the Topol or Sarmat missile at distances that are impossible for the American missile shield to intercept..
Then this question arises: why do some countries justify all of America's actions and its provocation to the Russians near their borders?..and when Russia intervenes to protect its national security, it is demonized..
The matter is similar to all the wars that the US carried out in Afghanistan, Iraq, Syria, Libya and many other lands, but it is different now because the Russians are not weak like those countries..
So as a neutral and rational person, I prefer that there will be a multipolar world on this planet as nature made the north and south pole to balance things out and insure polarity and thus equilibrium..