Belgian Defense Minister Theo Francken said this on VRT, Ukrinform reports, citing Euractiv.

"This is non-negotiable, the door is closed," Francken said.

Last week, Sweden, Poland, the Netherlands and Spain called upon the European Commission to explore new ways to harness around EUR 200 billion in immobilized Russian assets to support Ukraine.

At a dramatic European summit last December, Bart De Wever, the Belgian leader, shot down an effort led by Germany and the European Commission, to fashion a EUR 210 billion "reparations loan" for Ukraine, arguing it would leave the Benelux nation exposed to Russian legal retribution.

Most of the assets are held at Euroclear in Belgium. "Our prime minister will stand firm," Francken added.