putin. >> as you know, though, president zelenskyy asked for a formal no fly zone, the u.s., nato has so far refused to do so saying perhaps understandably that that could lead to direct military conflict between the u.s. and russia. what it is sending in and rereported are additional air defense systems including the s 300 which is a soviet air system, high altitude. does that compensate in your view, does that protect the skies over ukraine sufficiently? >> well, i think president biden is making the right call when he says that we're not going to put american boots on the ground or american pilots in the air but i was very pleased to see the stepping up of support on the air defense side. the s 300 system is what needs to be sent in right now because you know ukrainians are familiar with that system. it's a former soviet air system