Ukraine tensions: US says Russia invasion could begin any day

The US has warned that Russia could invade Ukraine "at any time" and American citizens should leave immediately. The White House said an invasion could start with aerial bombing that would make departures difficult and endanger civilians. Moscow has repeatedly denied any plans to invade Ukraine despite massing more than 100,000 troops near the border.

Also in the programme: Large numbers of people are continuing to occupy a vital Canada-US border crossing, hours after an injunction to end the blockade took effect. And researchers from Cambridge University say our musical tastes are determined by our personalities.

Julian Worricker has two guests to discuss these and the day's other stories. Joanna Chiu is a Canadian author and senior journalist for the Toronto Star. Carlos Lopes is a professor at the Mandela School of Public Governance at the University of Cape Town and former UN Under-Secretary General.

(Photo: National Security Advisor Jake Sullivan responds to questions at the White House. Credit: EPA/Shawn Thew/Pool)