world. >> a real, real hero. you know this. the russian ministry said it summoned, warning that rush-american relations and i'm quoting now, on the verge of rupture after president biden called vladimir putin a war criminal and a thud. what is the worst-case scenario if they were to cut off all diplomacy with the united states? >> i certainly home that doesn't happen. we need to have some channels open with other countries, certainly allies but more importantly, with adversaries. if that were to happen, we can always communicate with other parties. it is obviously. better to have direct channels. >> a lot of experience as a career diplomat. thank you again for joining us. thank you for all you've done. let me once again tell our