"I call on my European colleagues to discuss Mikhail Saakashvili's release with Georgia's prime minister," Donald Tusk, president of the European People's Party and former president of the European Council, wrote on Twitter.

"Today, at the Eastern Partnership summit, I call on my European colleagues to discuss Mikhail Saakashvili's release with Georgia's prime minister, the third Georgian president to begin negotiations on the EU-Georgia association agreement," Donald Tusk wrote.