Ex-US Ambassador: 'We could go after more of Putin’s cronies'

Theresa May and Donald Trump are said to have agreed there is a window of opportunity to convince Russia to abandon its support for Syria. They and the rest of the G7 club of the world's richest nations are now considering a further tightening of sanctions on Putin and his allies. Will it work?

Professor Daniel Fried, former US ambassador under Barack Obama, told Today that there are plans in place in case of an escalation of tensions between Russia and the US.