4:25
According to senior U.S. administration officials, the mood at NATO's emergency summit has been \"sober\" and \"resolute\" so far.
\"There was a very strong sense that we are facing a significant historical moment, and very strong support from all the leaders who spoke about the need to defend our democracy,\" one of the officials told reporters during a telephone briefing Thursday.
![\"PHOTO:](\"http://a.abcnews.com/images/US/Zelenskyy-1-ap-er-220324_1648142731153_hpEmbed_3x2_384.jpg\")
The officials said Zelesnkyy, who addressed NATO leaders remotely, spoke \"very eloquently\" and \"repeated his requests for continued and increased Western security assistance.\"
\"But notably, there was not a request for a no-fly zone,\" an official added. \"There was also not a request for NATO membership.\"
Zelesnkyy did ask for NATO to give 1% of all its tanks and said he hasn't been given an answer.
\"I have been repeating the same thing for a month now: To save people and our cities, Ukraine needs military assistance without restrictions, as Russia uses without restrictions its entire arsenal against us,\" he continued. \"Ukraine asked for your planes so that we do not lose so many people. And you have thousands of fighter jets, but we haven't been given any yet.\"
![\"PHOTO:](\"http://a.abcnews.com/images/US/ukraine-3-ap-er-220324_1648140787818_hpMain_4x3t_384.jpg\")
\"We asked for tanks so that we can unblock our cities that are now dying,\" he added. \"You have at least 20,000 tanks. Ukraine asked for a percent -- 1% -- of all your tanks to be given or sold to us. But we do not have a clear answer yet.\"
Speaking after Zelenskyy's speech, Biden that Thursday marks one month since Russia launched its invasion of Ukraine. He discussed the sanctions that have already been imposed and expressed strong support for Ukraine as well as humanitarian and military aid and reaffirmed his support for Article 5, which is the cornerstone of NATO and states that an attack on one member is an attack on all members.
Since Russian President Vladimir Putin launches his invasion one month ago, 3.5 million Ukrainians have fled the country and millions more have become internally displaced.
![\"PHOTO:](\"http://a.abcnews.com/images/US/biden-1-rt-er-220324_1648142414951_hpMain_4x3t_384.jpg\")
Biden is scheduled to travel to Poland on Friday.
As the fighting continues, Secretary of State Antony Blinken announced on Wednesday that the State Department has made a formal assessment that Russian forces have committed war crimes in Ukraine.
ABC News' Ben Gittleson, Conor Finnegan, Sarah Kolinovsky, and Justin Gomez contributed to this report.
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