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The biden administration facing a broad diplomatic and national security challenge when it comes to china. on the cybersecurity front, today, several key infrastructure hubs and federal contractors face new security mandates. government officials are concerned about ongoing threats from china and russia, all of this coming at the same time as the u.s. is navigating the tender situation between china and taiwan. cnn senior national security correspondent alex marpart joins us. china is becoming one of president biden's i would say biggest tests at this point. >> it really is, erica. this is a h...

Table at their summit, the reason ransomware attacks in the u.s. which authorities say originated from russian hacking groups, biden said the u.s. will respond in kind if russia refuses to cooperate on the cybersecurity front. in his exclusive interview, nbc news foreign correspondent keir simmons put this question directly to putin. >> mr. president, are you waging a cyber war against america? >> translator: where is the evidence? where is proof? it's becoming farcical. we ever been accused of all kinds of things, election interference, cyberattacks, so on and so forth, and not once, not once...