Sanctions curbing arms sales to Russia and cutting off financing to some of the countries banks were formally adopted by the European Union today.
Officials said the sanctions aim to inflict maximum pain on Russia and minimum pain on the 28 member states of the EU, but Russia denounced the sanctions as "destructive and short sighted."
More top news
Alastair Stewart explains how significantly he rates the UK's decision to leave the EU as a political story.
The move comes amid a motion of no confidence that was tabled against Labour leader Jeremy Corbyn.
The first anniversary of the Sousse terrorist attack - which left 30 Britons dead - will be marked by families of the victims on Sunday.