White House says President Donald Trump still wants to buy Greenland, but has said military means are an option, too.
Trump and Rubio say they want to use the oil to help Venezuelans. That's not what the US track record shows.
Video released by Russian state media is said to show a US coast guard vessel shadowing a Russian-flagged oil tanker.
Fighting in Aleppo between the Syrian army and the Kurdish-led SDF has forced thousands of people to flee.
Russian submarine and warship are in the vicinity as the US operation unfolds, news report says.
Chief of staff Kyrylo Budanov says progress has been made at key Paris summit.
Violence follows collapse of talks aimed at absorption of semiautonomous Kurdish forces by state institutions.
The Syrian army has declared Aleppo’s Kurdish areas 'closed military zones' and ordered civilians to leave.
Tens of thousands of people have crossed into Burundi to escape violence in the eastern DRC.
Thousands of people have been fleeing their homes ahead of a curfew in the Syrian city of Aleppo.