Just because the coup favors the west does not make it more legal. In any case the coup was funded and planned from the west and thus it voided the memorandum before Russia did anything.
And again, you seem clueless as to what alliance means - the word that set you off.
“In any case the coup was funded and planned from the west”
BWAHAHAHAHA - yes those were top secret used tires and rocks that the CIA gave the Ukrainians to push back the Russian thugs who killed hundreds in the city square.