A Russian oil tanker, the Anatoly Kolodkin, carrying 730,000 barrels of crude, is nearing Cuba, challenging a de facto US oil blockade. The ship is expected to arrive on Monday.

• The tanker is under US sanctions.
• The arrival challenges the US's energy pressure on Cuba, which has faced severe fuel shortages since January.
• An expert noted it's unlikely the United States will intercept the vessel now that it is close to Cuban waters.