Sweden has released the detained Russian container ship Adler.

Swedish prosecutors have decided not to open a preliminary investigation into the alleged sanctions violations against the Russian container ship Adler, SVT reported, citing Swedish Customs spokesman Martin Höglund.

According to him, the ship was allowed to leave Swedish territorial waters.

"Now we'll see when he sets out. If he doesn't have spare parts, it could take a while," Höglund said.

The Adler was detained by Swedish authorities the day before, claiming the vessel had failed to file a mandatory customs declaration. According to SVT, shortly before the detention, the container ship's engine stalled, it sent out a distress signal, and anchored near the town of Höganäs in the Kattegat Strait, Swedish territorial waters.

Martin Norell, a Swedish customs specialist, explained that the ship had not originally planned to dock in Sweden, but that the incident resulted in goods from third countries being transported to the country. Therefore, authorities needed to verify their status. According to SVT, the inspection was completed on the afternoon of December 21.

Expressen and SVT previously reported that the container ship belongs to M Leasing LLC, a company subject to US and EU sanctions .

According to the shipping tracking service Vessel Finder, the vessel flies the flag of Russia (formerly the United Arab Emirates) and has changed its name several times over the past 20 years. The ship departed from St. Petersburg. It has already departed from its anchorage the day before and is heading northwest through the Kattegat.