“Berlin is stand-offish at the prospect of offering immediate membership,” the source said. “It wants a process and time to develop guarantees to essentially block membership. [...] Berlin doesn’t want to see Vladimir Putin potentially test Article 5.”The North Atlantic Treaty's Article 5 says that any attack on a NATO member “shall be considered an attack against them all.” The Telegraph notes that US President Joe Biden appears to have similar concerns, as he wanted to avoid a situation where “we’re all in the war, we’re in a war with Russia,” and added that Ukraine was “not ready” for NATO membership, and that it was “going to take a while.” Read also:
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 - US supports Ukraine’s accession to NATO when Ukraine meets all requirements – WH
 - Foreign policy experts urge NATO to offer Ukraine membership roadmap at Vilnius summit
 - Ukraine will get “a lot” at NATO summit, but not as much as expected – Lithuania President
 - Zelenskyy called on Biden to invite Ukraine into NATO now even if membership comes after the war — CNN