Kaja Kallas warns about great danger. It concerns ships from Russia. Experts call these ships 'shadow fleet'.
The ships are very old. They are in bad shape. They also lack good insurance. Kallas calls them ecological time bombs.
An accident can cause an oil disaster. The oil would pollute the coasts in Europe. Russia uses the ships for oil trade.
Russia uses the money to fund war. The EU wants to stop this. The EU has punished 670 ships. Such punishments are called sanctions.
The EU works with other countries. Many ships now lack a flag. Without a flag they can rarely enter ports. This makes trade hard for Russia.
