LONDON, May 23 (Reuters) -Official data from China this week showed Russia continues to be its top oil supplier, including for April, as refiners cashed in on discounted shipments. A big casualty of this shift has been Angola.

* Once Angola's key customer, Chinese imports of Angolan crude and condensates in April fell to their lowest in over a decade, Kpler data shows.

* In April, China imported about 15 million barrels of crude and condensates from Angola, down from the 18 million barrels it imported in the same month last year, and a far cry from the roughly 33 million barrels it imported in April 2017, the data showed.

* Separately, for the first time in 20 months, crude oil processing in China was also lower than in the same month last year, reflecting feeble refinery margins and a shoring up inventories. "The latest data also confirm that oil demand in China is likely to lose significant momentum this year," Commerzbank analysts wrote in a note this week.

* Angola's July schedule emerged last week, while Nigeria's July schedule is expected to come next week.

Reporting by Natalie Grover in London; Editing by David Gregorio

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