Oil exports from Kazakhstan’s three largest fields resumed on Monday after the reopening of a pipeline that had been closed for a week due to drone attacks on tankers waiting to load at the Black Sea terminal.

Kazakhstan’s Ministry of Energy and the Caspian Pipeline Consortium confirmed the resumption of operations, also announcing the arrival of two tankers for oil loading at the terminal.

The terminal, located near the Russian port of Novorossiysk on the Black Sea, had suspended loading operations following attacks by unidentified drones on four tankers between July 17 and 20.

The pipeline shutdown led to reduced oil production at the Tengiz field, as well as at Kashagan and Karachaganak—Kazakhstan’s three largest oil projects. Tengiz is operated by Chevron, Kashagan by a consortium including Eni, Shell, ExxonMobil, and TotalEnergies, and Karachaganak by Eni and Shell.

Almost all production from these fields is transported via the Caspian Pipeline, a 1,500-kilometer route connecting Tengiz to the Black Sea terminal in Russia.

The Caspian Pipeline Consortium and Russian authorities accused Ukraine of carrying out the drone attacks. Military officials in Kyiv did not claim responsibility for the attacks on the consortium’s facilities and the damaged tankers, but did confirm strikes on two unspecified tankers in the Black Sea that coincided with the timing of the recent attacks.

In June and July, Ukraine reported a series of air and sea drone attacks on Russian tankers and other vessels in the Azov and Black Seas, aiming to disrupt Russian maritime logistics.

The Caspian Pipeline was commissioned nearly 25 years ago to provide a stable export route for Kazakhstan’s three major projects. Its capacity has been expanded several times and it now transports volumes equivalent to more than 1% of global oil demand.

The operator of the Kashagan field, North Caspian Operating Company (NCOC), reported adjusting production volumes in response to current operational conditions and continues to monitor the situation at the Caspian Pipeline terminal.

Comments from Chevron and Karachaganak Operating Company regarding the situation have been requested.