and it is bound to get more bloody and brutal, david. >> and martha, i know you're learning more tonight about what your sources at the pentagon believe about vladimir putin, perhaps his state of mind and you've learned that he's gone to the military command center several times, demanding repeated updates? >> reporter: he has. putin is described as erratic, but totally intent on seeing this war through. a senior official says he is spending more time in the military command center, basically a bunker under the kremlin, asking for constant updates on the fight, david. >> martha raddatz with us from washington tonight. martha, thank you. and tonight, of course, tightening the squeeze on vladimir putin's inner circle. president biden targeting a new group of oligarchs today, as well as some of their relatives and close associates, blocking their travel to the u.s., moving to seize their assets, yachts, and jets seized. while inside russia tonight, the ruble has now lost half of its value.