This wave is just getting going. From Sundance at theconservativetreehouse:
British Prime Minister Boris Johnson resigned. Days later, former Japanese Prime Minister Shinzo Abe was assassinated. A few days passed and both the President and Prime Minister of Sri Lanka, resigned and fled the country. Today, with their ruling governments in a state of turmoil, Estonian Prime Minister Kaja Kallas and Italian Prime Minister Mario Draghi have both tendered their resignations.
The collapse of each of these national leaders is not necessarily connected; however, the global political system is reverberating with tremors directly connected to the post-pandemic economic turmoil. It would be naïve not to see these governing issues as consequences. The legitimacy of the governing class is slipping; perhaps it would be fair to say, some have ‘lost’ their legitimacy altogether.

Estonia is part of the EU and a member of NATO:
HELSINKI — Estonia’s president on Thursday asked Prime Minister Kaja Kallas to form a new government after she tendered the resignation of her one-party minority Cabinet, ending a more than month-long political stalemate in the Baltic nation.