"Making a list of sanctions not only does not help defuse tensions but it is used by the Unites States and European Union authorities as a political tool for further escalation of contradictions that they have with Russia", Papadakis, from the Communist Party of Greece, said during an interview on Thursday.
On Wednesday, Mogherini called for Savchenko's immediate release, stating that this would be in line with Russia's human rights commitments as well as the Minsk peace agreements.
Savchenko is suspected of helping to direct artillery fire near the eastern Ukrainian city of Lugansk on June 17, 2014, that led to the deaths of two Russian journalists, Igor Kornelyuk and Anton Voloshin.
Russian prosecutors are seeking a 23-year prison sentence for Savchenko. The 34-year-old Ukrainian citizen denies all allegations. A court ruling in the case is due on March 21-22.