why it was more a coup d’état than a legitimate revolution?

A revolution involves a change in the mode of production. This was a coup with a change of government, regardless of its legitimacy.

What percentage of Ukrainians, as a ballpark, would you estimate supported Yanukovych’s removal?

The issue at hand is whether NATO had a role in it. The statistics are by-the-by.

How many Ukrainian troops are literally on the eastern side of the border vs. Russian troops on the western side of the border?

Nobody is denying that Russia has troops in Ukraine, and I doubt anyone is denying that it gave military support in Eastern Ukraine before the invasion. The question, again, is whether NATO was involved. The two are not mutually exclusive.

planned fortress

I doubt very much that this is literal language. Does it change the meaning if it was imagery, instead?

What statements or actions by US or NATO members can you point to that attempted to “draw” Russia into attacking Ukraine?

It's in the suggestion that Ukraine could join NATO, which lead to putting NATO nukes within the 'safe zone' of Russia's nuclear program. That is, NATO could nuke Russia before Russia could retaliate.

Can you elaborate on the provocation?

Shelling ethnic Russians. See links above.

Did Ukraine, for example, … bomb apartment buildings or hospitals on the Russian side of the border?

Within Ukraine, the parts inhabited by majority ethnic Russians. See links above.

How many people injured in this ethnic violence?

See links above. Minimum 10,000, likely over 14,000 deaths. Tens of thousands injured. Millions displaced.

What was the aim of the special military operation – removing Zelensky from power? Disarming the Ukrainian military? Annexing Ukrainian territory?

If you believe Russia, demilitarisation of and denazification within Ukraine, to prevent the indefinite targeting of ethnic Russians. If you believe NATO? Who the fuck knows; they change their interpretation every week.