The European Union (EU) intends to make Russia’s “shadow fleet” the main target of a new sanctions package because it helps Moscow bypass restrictions on oil exports, according to several European officials and diplomatic sources, Politico reports.

Tightening the screws on the fleet will help choke off one of the Kremlin’s most important revenue streams—and increase pressure on Russian President Vladimir Putin to drop his maximalist demands in any Ukraine peace deal, EU officials said.

The new package of sanctions will become the 21st for the EU, Politico recalls, adding that it could come into force in late June or early July.

In addition to the “shadow fleet,” the package is expected to include measures against Russian banks, financial institutions and military-industrial complex enterprises, as well as companies involved in Ukrainian grain trading, seven EU officials and diplomats familiar with the discussions told Politico.

The European Union intends to re-examine the sanctions package blocked by Hungary.

Patriarch Kirill of Moscow and All Russia is also targeted for sanctions for his support for Moscow’s actions in the Russo-Ukrainian war.