Energy company acquisitions dominated the billion-dollar transactional tables last week and a big deal announced over the weekend—one specifically structured to avoid Western sanctions—has yielded roles for a half-dozen firms from the U.K. and India.

The Wall Street Journal reported Friday on a $13 billion deal that will see a consortium led by Moscow-based energy giant NK Rosneft PAO, Russian investment fund United Capital Partners LLC and commodities trader Trafigura AG acquire a 49 percent stake in Essar Oil Ltd., an Indian oil refiner and fuel retailer.