Seems like you're claiming Ukraine's 2014 "Revolution of Dignity" and subsequent democratic elections were something the USA did. That's a controversial claim, and one that ignores the recorded actions and sentiments of the Ukrainian people. It's also unrealistic and gives the US too much credit.

The US does have their hands in pies across the globe, but that was a large scale uprising of Ukrainian people. No outside force can make something like that happen if the people aren't already aligned.

The simpler explanation is the Ukrainian people wanted to be closer to the EU, and didn't like Yanukovych's authoritarian tendencies. I wouldn't be surprised if some propaganda blamed it on the US, but it doesn't make sense. If the US wanted to do regime change and the public wasn't behind it, it would look very different. There are unfortunately many examples.

> a separator between Russia and NATO countries

Why does Russia need a separator between itself and NATO countries? What do you think is going to happen without it?

If the US did interfere, that’s poor. What do you think of Russian involvement in Ukrainian elections?

> Russia's war against Ukraine has never been about getting more territory,

That's completely counter to everything we know about Putin's mindset, and completely counter to all his actions so far. How would a war for territory look any different to what is occurring now?

> when Ukraine has to be a sovereign and neutral state

That's an oxymoron. Why does a sovereign democratic have to be neutral? A democratic state has the right to pursue whatever alliances it chooses.