One similarity is, if I'm correct, Russia claimed that the naval base of Sevastopol was vital for Russian security.

The protection of the population and the illegitimacy of the current government was an argument developed by Russia at the time, it has not been yet by USA but I suspect this might start develop in the next few weeks.

The common ingredients to justify an invasion/annexation is a mix of: - Self-Defense, security - Historical, Geographical claims - Protection of the population - Moral sugar coating (we had no choice)

You are clearly wrong. Both Trumpism and Putinism are reactive ultra-conservative ideologies. Annexation of Crimea was motivated largely by Russia's "legitimate security concerns". Russian propaganda was busy convincing the population that Crimea gives strategic control over Black Sea region and if Russia didn't intervene, there would have been NATO bases on the peninsula after the Maiden revolution. Trump and his sycophants are saying the same thing: American security, Arctic, and American geopolitical foes: China and Russia.