1. Referendum that proclaims Crimean Republic (Crimea had such right by USSR constitution, but Rada in Kiev ignored anything),
en.m.wikipedia.org/wiki/2014_Crimean_status_referendum
"The referendum was
illegal under the Constitution of Ukraine.[15] It is
not recognized by most countries,[16] usually because of the presence of Russian forces.[17] Thirteen members of the United Nations Security Council voted in favor of a resolution declaring the referendum invalid, but Russia vetoed it and China abstained.[18][19] A
United Nations General Assembly resolution was later adopted, by a vote of 100 in favor vs. 11 against with 58 abstentions, which
declared the referendum invalid and affirmed Ukraine's territorial integrity.[17]"
2. Petition to accept Crimea to a Russian Federation as a subject of Federation.
Such "petitions" made on an occupied territory are invalid.
All of that - the "referendum" and the "petition" happened after the RuSSian "green men" appeared in Crimea, not before.
A bit different thing, compared to your forceful annexation.
Not at all. It was a forceful annexation - with the use of RuSSian military. It was an act of agression against another country - Ukraine.
Russian military presence was permanent in Crimea. Navy base was there, with a lot of personnel (well within limits set by agreements signed during USSR "destruction").
They were supposed to sit in their bases and not take over Ukrainian territory lol
Besides, those RuSSian "green men" weren't wearing RuSSian uniforms and at first Putin lied that they are "local people who bought guns on the internet" lol