Germany will insist on postponing Ukraine's accession because it fears that this step could drive the alliance into a war with Russia.
A source of the alliance said that Berlin would use the annual NATO summit this week in Vilnius, Lithuania, to urge others to concentrate on security allowances and not on accession proposals to help Ukraine if there is no accession.
"Berlin is the prospect of offering immediate membership," to the reluctant to offer, "the source told The Telegraph. "It takes a process and time to develop guarantees to essentially block membership."
"Berlin does not want Wladimir Putin possibly test article 5."
According to the Article 5 clause of the NATO alliance, every member state that is attacked by an external attacker has the right to demand military intervention from the other allies.
Joe Biden seemed to repeat the German concerns and said he wanted to avoid a situation in which "We are all in war, we are in a war with Russia."
Mr. Biden added that Ukraine was "not ready" for NATO membership and that it would "take a while".
his national security advisor Jake Sullivan said: "We are not striving to trigger the Third World War. After this summit, Ukraine will not join NATO."
Wolodymyr Selenskyj, the Ukrainian President, gradually reinforced his campaign for a NATO joining Ukraine after Russia's invasion of last year and is trying to drive a clear wedge between his country and Moscow.
The war guide asked the 31 NATO member states to take concrete steps towards Ukrainian membership so that his country can quickly join the transatlantic alliance after the war.
Germany and the United States have warned privately that this step could escalate the current conflict for an active war between NATO and Russia.
Mr. Putin has often claimed that NATO's expansion towards the Russian borders has been a key factor for his decision to invade Ukraine over the past two decades.
Since then, the Russian President threatens to use nuclear weapons in the war, which in western countries fueled fears of escalation.