MOSCOW, Nov 6 (Reuters) - Russia's Orenburg gas processing plant has increased gas intake from the Karachaganak field in Kazakhstan since the start of November in a gradual recovery since it was hit by a drone attack last month, two industry sources said on Thursday.

The strike on the Orenburg plant about 1,700 km (1,056 miles) east of Ukraine as part of Kyiv's campaign against Russian energy infrastructure marked the first known disruption to Western oil majors operating in Russia.

The incident led to reduced oil and gas condensate output at Karachaganak, a major field developed by an international consortium that includes U.S. major Chevron CVX.N, Shell SHEL.L and Eni ENI.MI, underlining the vulnerability of cross-border energy assets to the continuing conflict.

The sources said that output at Karachaganak has been increased from early November by about 15% to between 30,000 and 32,000 metric tons per day, from about 26,600 tons previously.

Planned production volumes stand at up to 35,500 tons per day.

The Orenburg plant resumed operations at one of three production lines on October 22, with a second line coming back on November 1, the sources said, adding that the remaining line will be restarted in mid-December.

(Reporting by ReutersEditing by David Goodman)