I appreciate that last week the UN special envoy to Ukraine ran into some difficulties, but what discussions have taken place about the UN's role in the escalating Crisis in Crimea?

The Crisis in Crimea represents perhaps the most significant security threat on the European continent in decades, and it poses a real threat to Ukrainian sovereignty and territorial integrity.

The Crisis in Crimea represents the most significant threat to security on the European continent in decades.

Does the Prime Minister agree that when the history of the Crimea Crisis comes to be written, it will be found that there were no winners?