Soviet Union and its last leader Mikhail Gorbachev ignored the rights of 16 million East German citizens when he agreed to the German reunification treaty. As a result, these people became – and still remain – second-rate citizens.
When we say ‘schism’, we all speak not of the Church schism per se, but of the schism in the Ukrainian society, the schism in the Russian world, which Ukraine is a part of, if you will.
Ukraine is recognised in international law as a sovereign nation state, with its own flag, nationality, language etc. "Russian World" is a narrative created by the Kremlin for its own political purpose. Ukraine is currently defending itself from Russian aggression on its territory, see e.g. http://euvsdisinfo.eu/report/russian-spring-civil-war-was-unleashed-in-east-of-ukraine-by-little-nazis-in-kyiv-after-a-coup/