The countries on the eastern flank of nato including latvia so concerned if president putin overtakes ukraine they could be the next targets. i spoke about what type of message they try to send to russia or any other adversary. >> we believe in defense. you know, defense through deterrence and readiness and some of the best way to deter an enemy is to let them know that you are ready so exercises are critical to hone the skills and be ready for whatever the nations ask us to do or we decide to do as an alliance. >> reporter: when we talk about nato, we often talk about defense and deterrence. ...