I caught up with Ambassador Karen Pierce in the middle of a very intense day of diplomacy on February 22. 

She is the United Kingdom's Ambassador to the United States and earlier that morning Boris Johnson announced new British sanctions on certain Russian oligarchs and financial institutions. This was followed by similar sanctions announcements by the European Union and the United States later in the day. 

These new sanctions come after Vladimir Putin's government formally recognized the independence of two regions of Eastern Ukraine,  and Luhansk.  This specific set of sanctions from the UK, EU and USA seem to be a very calibrated and coordinated response to this provocation, which we discuss at the outset of this interview.