Oil tanker traffic leaving Russian ports was down by half in the first two days after the European Union ban on seaborne imports, according to a vessel tracking service.

About 1.94m barrels per day (bpd) were shipped from Russia from 5 December with some believed to be heavily discounted cargoes bound for India, according to TankerTrackers.com.

The site recorded 3.5m bpd being carried by sea in the month before 5 December, when the EU seaborne import ban and a price cap scheme championed by G7 countries was introduced.