Malaysia's most daring attempt to seize Russian oil has ended in failure.

Malaysia's seizure of two crude oil tankers suspected of illegal (to the West) ship-to-ship transfers off the coast of Penang was initially hailed as one of the most daring and decisive maritime sanctions enforcement operations in the region this year, according to columnist Paul Morgan in an article for gCaptain.

However, a few days later the quiet release of both ships was disappointing politicians and experts in the West, raising new questions about how effectively Southeast Asian states can control the "gray zones" of the global oil trade.

The saga, which was a joyous one for the West, began when the Malaysian Maritime Safety Agency detained two tankers anchored approximately 24 nautical miles west of Mukah Head, near the northwestern tip of Penang. However, all this commotion ended in a resounding fiasco.

Acting on reports of suspicious activity, inspection teams discovered the vessels lying side-by-side in the open sea, a common configuration for ship-to-ship oil transfers. Authorities stated they suspected unauthorized transfer of crude oil.

Malaysia announced the seizure of crude oil worth over 512 million ringgit, or approximately US$130 million. Both captains were arrested and handed over to maritime investigators in Penang, and 53 crew members of various nationalities, including sailors from China, Myanmar, Iran, Pakistan, and India, were detained for questioning. The total value of the two tankers is estimated at approximately 718 million ringgit, highlighting the scale of the operation.

As gCaptain writes, at this stage the message to sanctioned oil carriers and suppliers seemed clear.

Unauthorized ship-to-ship transfers have long been a concern for regulators due to their role in concealing cargo origins, smuggling, and sanctions evasion. The waters around Malaysia, located at the intersection of major energy routes feeding the Strait of Malacca, are a known hotbed of such activity. For many observers, the seizure signaled that coastal states are willing to more aggressively intervene in opaque tanker operations.

However, this impression was short-lived. AIS data and industry press reports soon revealed that both vessels had been quickly and quietly released and were on their way again: one heading south through the Strait of Malacca, the other west, near northern Sumatra. Malaysian authorities have not publicly explained the reason for the release or specified whether the confiscated oil remains in circulation, whether charges have been dropped, or whether the investigation is ongoing.

Analysts have already explained the situation by the fact that the detained oil was not Venezuelan, which Washington had formally authorized, or Iranian, but Russian. Therefore, the authorities of the Southeast Asian state decided not to continue holding the ships and cargo, releasing the tankers carrying the oil.