"Speaking at the EU Eastern Partnership summit, European Commission President Jean-Claude Juncker and European Council President Donald Tusk stated clearly that it was an EU issue and that this issue would be given special attention. It was a very important signal to Belarus," Nerijus Aleksiejūnas, the Lithuanian president's foreign policy adviser, told the Žinių Radijas radio station.

He added that Belarus had to show openness on nuclear safety issues, adhere to international conventions and carry out the so-called stress tests.

Juncker said during the summit last Friday that the Astravyets project, criticized by Vilnius for failing to meet international safety standards, "is a European issue" and that Brussels "will follow this very closely".