The United States and the European Union have agreed to place tough sanctions against Russia over its support for rebels in Ukraine.
US President Barack Obama said Russia’s economy had been hurt by earlier sanction, but this would hurt even more.
The new restrictions include banning Americans or people in the US from banking with three Russian banks.
Russia denies that it is supplying heavy weapons to the rebels.
Experts have not been given full access to the crash site of flight MH17 and many EU countries believe that this shows that they are trying to hide something. All 298 people on the Malaysia Airlines jet were killed, many of them Dutch citizens.
Western governments believe rebels in Ukraine shot the plane down on 17 July with a Russian missile, believing it to be a Ukrainian military flight.