In particular, in this document both Russia and the US recognize each member of the OSCE, including Ukraine, has the sovereign right to join any alliance.
When Russia invaded it shredded its main security agreement with almost all of Europe, which is why almost all of Europe is supporting Ukraine.
When Russia invaded it shredded its main security agreement with almost all of Europe, which is why almost all of Europe is supporting Ukraine.
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Instead, they agreed that any country had the right to join any alliance when they centered the Paris Charter of 1990 on the Helsinki Accords.
In 1990 they did not know the USSR would collapse in 1991...
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They all thought they would lower tensions and demilitarize both NATO and the Warsaw Pact using the OSCE (based on the Helsinki Accords) as the security framework.
Then the USSR and Warsaw Pact fell apart the next year.
https://www.rbth.com/international/2014/10/16/mikhail_gorbachev_i_am_against_all_walls_40673.html
In particular:
All have a right to security.
Those which joined NATO have had peace and security.
Those which didn't have had 35 years of strife and brutality,
with over 300,000 dead before 2014.