The European Union has frozen Russian assets worth 13.8 billion euros, European Commissioner for Justice Didier Reynders said, Reuters reports.

He said the vast majority of them come from only five of the 27 EU member states, and urged others to step up.

"For the moment, we have frozen funds coming from oligarchs and other entities worth 13.8 billion euros, it's quite huge," EU Justice Commissioner Didier Reynders said on Tuesday.

"But a very large part, more than 12 billion comes from five member states so we need to continue to convince others to do the same," he told reporters on arriving to a meeting of the national justice ministers in the Czech capital Prague.

He said he expects a final political agreement on a new legal instrument that would make breaching or circumventing sanctions a criminal offense throughout the EU after the summer.

A policy designed to limit circumvention of restrictions by transferring assets to family members who are not sanctioned could go into effect in the fall.