If Russia does not return to PACE (the Parliamentary Assembly of the Council of Europe), Turkey and several other countries will leave after it. It will become a marginal club. This organisation will be destroyed without Russia and several other countries.
Summary
Five years ago the EU and the US intervened in the domestic affairs of Ukraine where they supported and provoked an anti-constitutional coup. As a result, Ukraine became a major source of regional instability.
Disproof
Recurrent pro-Kremlin narrative about the Euromaidan and alleged Western interference into Ukraine.
Background:
The demonstrations which began in Kyiv in November 2013 – called "Maidan", or "Euromaidan" – were not provoked from outside but were a result of the Ukrainian people's frustration with former President Yanukovych's last minute U-turn when, after seven years of negotiation, he refused to sign the EU–Ukraine Association Agreement and halted progress towards Ukraine's closer relationship with the EU as a result of Russian pressure. The protesters' demands included constitutional reform, a stronger role for parliament, formation of a government of national unity, an end to corruption, early presidential elections and an end to violence http://bit.ly/2ftv6iT.