The US has announced more than 500 new sanctions against Russia over its invasion of Ukraine and the death of opposition leader Alexei Navalny.

These include measures against Russia's main card payment system, financial and military institutions, and officials involved in Navalny's imprisonment.

The EU has also announced new sanctions on access to military technology.

The measures mark a week since Navalny suddenly died in an Arctic Circle jail.

US President Joe Biden, who met Navalny's widow and daughter in San Francisco on Thursday, has said there can be "no doubt" the Russian president was to blame for his death.

The newly-announced US measures also include nearly 100 firms and individuals which will also face export restrictions.

Others target the state-owned operator of Mir, Russia's main payment system, which has become more prominent since Visa and Mastercard suspended their services there.

Companies involved in powering Russia's war effort, developing the country's future energy production and its co-operation with Iran over drones will also be hit.