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The relevant letter, initiated by Vice-President of the Group of Liberals and Democrats Petras Austrevicius (Lithuania), was signed by 46 MEPs.

"We point out that this is you who will be personally and directly responsible for not preventing a tragic outcome before it becomes too late. We urge you to show due respect to your own commitments and obligations and immediately and unconditionally release Nadia Savchenko, as well as Oleh Sentsov, Oleksandr Kolchenko and other citizens of Ukraine illegally prisoned in Russia," the letter says.

According to MEPs, they remain very much concerned about an extremely fragile state of health of Nadia Savchenko, particularly when she has decided to renew a dry hunger strike, and demand her immediate release.

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Read alsoRussia conceals results on Savchenko's medical check – lawyer"We emphasize our determination to continue raising public attention to the case and draw your attention to the strong interest that a larger public has taken in the case of Nadia Savchenko in the EU and beyond as well as the degree to which the unfair and illegal process against her has harmed the image of the Russian government abroad," the authors of the letter said.

The signatories underline that the release of these citizens of Ukraine is one of the necessary steps towards possible normalization of the relations between the European Union and the Russian Federation.

Read alsoSavchenko asks Poroshenko to act more resolutely for her releaseIn addition, the politicians expressed strong protest concerning the "trial" of Nadia Savchenko.

"We, members of the European Parliament, address you in order to express our strong protest concerning the "trial" of Nadia Savchenko, a Ukrainian citizen, military pilot and member of the Verkhovna Rada of Ukraine and the Ukrainian delegation to the Parliamentary Assembly of the Council of Europe. We want to convey to you that we will never recognize the verdict against Nadia Savchenko, which we regard as illegal and fabricated. We strongly criticize this politically-orchestrated shameful decision of the Russian court and we call on the Russian Federation to stop violating the international humanitarian law and, in particular, the Third Geneva Convention relative to the Treatment of Prisoners of War of 12 August 1949."

"We also wish to remind you that under the Minsk Agreements the Russian Federation has agreed to the exchange of all hostages and illegally detained people on the basis of the all-to-all principle and call for its full implementation," MEPs said.