The Spokesperson of the EU External Action Service has expressed extreme worries over a thirst strike declared by Ukrainian pilot Nadia Savchenko.

"The European Union continues to call for Nadia Savchenko's immediate release," reads a statement released in Brussels.

According to the EU spokesperson, such a step would also be in keeping with the "Package of measures for the implementation of the Minsk Agreements" and the commitments therein to release all hostages and illegally detained persons related to the conflict in eastern Ukraine.

"The European Union underlines, as it has done on previous occasions that Russia bears responsibility for the health, well-being and observance of the human rights of all persons it detains," reads the document.