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The debate over the attempted murder of a former Russian double agent in the English city of Salisbury has now reached the United Nations Security Council. In a meeting called by the UK, Britain's charge d'affaires Jonathan Allen accused Russia and said that the chemical weapon used was so horrific that it's banned in war. Mr Allen called for a united response from the international community.

Russia's ambassador to the UN, Vassily Nebenzia, denied Moscow's involvement in the attack and demanded material proof from Britain to support its charge.

Mark Hollingsworth, co-author of the book Londongrad: From Russia With Cash tells the programme what further options for sanctions he thinks Theresa May has at her disposal.

This year's Worldwide Cost of Living Survey carried out by the Economist Intelligence Unit. Roxana Slavcheva, its author gives us a rundown of the most- and least-expensive cities to live in.

Presenter Roger Hearing is joined by two guests on opposite sides of the Pacific - Laura Lynch, correspondent with CBC news - who's in Vancouver, and Andrew Peaple, Deputy Asia Finance Editor, The Wall Street Journal, who is in Hong Kong.

(Picture: Russian Ambassador to the United Nations Vassily Nebenzia speaks during a UN Security Council meeting in New York. Credit: AFP/Getty Images)