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battlefield. now after a year of war, their powerful tributes ♪ >> announcer: this is "nbc nightly news" with lester holt good evening, and thank you for joining us tonight alex murdaughs sometimes failing memory, glaring contradictions and courtroom admission that he had lied to police were all fertile ground for prosecutors today as the accused double murderer spent another day testifying in his own defense. at moments displaying flashes of anger murdaugh on trial for the murders...

so lets get started. how safe is safe in east palestine, ohio? we are on the ground and hearing from a familiar face, three weeks since that fiery train derailment with new research now casting doubt on what health officials have been claiming. plus, it is the one year anniversary of russias brutal invasion of ukraine. as republicans climber to curb u.s. aid to ukraine, china winds now sending drones and ammunition to help russia. is theren end to the war insight? and later, charges of...

havent seen a yet, but i dont anticipate a major initiative on the part of china providing weaponry to russia. >> if they did, would that be crossing the line for you, mister president? >> it would be the same line everyone would have crossed. in other words, we will post severe sanctions on anyone who has done it. >> meanwhile, a group of media organizations, including nbc news, have asked house speaker kevin mccarthy to share 44,000 hours of security footage from january 6th. and at ...

fighter jets as of yet. despite the ask, the continued asks over the last year from president zelenskyy that they in fact do. >> well, what i will tell you is that, no disrespect to the president. my assessment is, if you want the ukrainians to defeat the russians today, then we have to give them all the equipment that they need. that means attack helicopters, air defense, missiles, long-range artillery. and, if you want to go after those rockets that are being fired on the key infrast...

And lied to many. >> youre able to just do that so easily and so convincingly and so naturally, dont you >> i mean, thats not for me to judge. >> thats true >> reporter: in a brief redirect, murdaughs defense team pointing to phone data showing maggies phone, which was thrown by the roadside, was never moving in sync with alex at any point after the murders. murdaugh again denying hes a killer. >> if i was under the pressure that theyre talking about here, i can promise you, i would hurt myself ...

>> you are able to just do that so easily and so defensively, so naturally, dont you? >> i mean, thats not for me to judge. >> that is true. >> in a brief redirect, murdaughs defense team pointing to phone data, showing maggies phone, which was thrown by the roadside, was never moving in sync with alex at any point after the murders. murdaugh, again, denying he is a killer. >> if i was under the pressure that they are talking about here, i can promise you i would hurt myself before i would hurt ...

With the victims just minutes before they died. >> in a brief redirect, murdaughs defense team pointed to phone data showing that maggies phone, which was thrown by the roadside, was never moving in sync with alex at any point after the murders. murdaugh, again denying he is a killer. >> if i was under the pressure that they are talking about here, i can promise you i would hurt myself before i would hurt one of them. >> we expect to hear several more witnesses on the stand at the beginning of n...