For joining the EU, a country should pay several tens of billions of euros. For leaving the EU, the country should double the entrance fee as in the case of UK.
If the country refuses to join the EU, it is punished with a Maidan like in the case Yanukovych. If the country does not want to pay, it receives a default like Greece. If you do not accept refugees, you receive sanctions like Poland and Hungary, while if you do not accept gays and do not conduct gay parades, you get fines like Cyprus.
No evidence given. Before entering the EU, each country chooses to agree or not with complying with EU's conditions for membership. Countries wishing to join need to have: stable institutions guaranteeing democracy, the rule of law, human rights and respect for and protection of minorities; a functioning market economy and the capacity to cope with competition and market forces in the EU; the ability to take on and implement effectively the obligations of membership, including adherence to the aims of political, economic and monetary union.
The demonstrations which began in Kyiv in November 2013 – called "Maidan", or "Euromaidan" – were not EU's punishment to Ukraine, nor were they provoked from outside. They 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 bit.ly/2ftv6iT, .