David Tennant says series on Litvinenko poisoning is timely


              This image released by ITVX/Sundance Now shows David Tennant as Alexander Litvinenko in a scene from the series "Litvinenko." (ITVX/Sundance Now via AP)
            
              This image released by ITVX/Sundance Now shows David Tennant as Alexander Litvinenko in a scene from the series "Litvinenko." (ITVX/Sundance Now via AP)
David Tennant says series on Litvinenko poisoning is timely