As part of its years-long effort to reduce reliance on US currency amid a deepening standoff with Washington, Tehran has announced it will start reporting foreign currency amounts in euros rather than dollars.

The United States is imposing a fresh set of sanctions on North Korea - the "largest ever", President Trump says.

Russian President Vladimir Putin says a list of officials and businessmen close to the Kremlin published by the US has in effect targeted all Russian people.

The latest US sanctions targeting Russia's oil and gas sector will cause Gazprom some headaches in building the new gas pipeline to Germany, experts say. However, US restrictions are unlikely to stop the project.

New penalties against Moscow proposed by US lawmakers violate international law and officials in Brussels should consider countermeasures, the German economy minister said on Monday.

The European Union has expressed concern about US plans to impose fresh sanctions on Russia, amid concern they could hurt energy companies.