Ukraine formally applied to join NATO Friday, but the alliance is likely to react cautiously to avoid provoking a full-blown conflict with Russia since members are pledged to come to each other's defense.

President Volodymyr Zelensky announced the accelerated bid in a video address to the nation, saying Ukraine has already made its "path towards NATO," demonstrating "compatibility with the alliance's standards."

"We trust each other, help each other and protect each other," he said. "We know it is possible."

A NATO spokesperson didn't immediately comment. NATO Secretary General Jens Stoltenberg is due to speak at a previously planned press conference at 6 p.m. Brussels time.

Ukraine may have trouble getting allies to even accept the invitation given the current tensions with Russia. Putin has repeatedly pointed to NATO's enlargement as a threat to Russia, even though US and European officials have dismissed those allegations.

Ukraine's bid would need signoff from all 30 allies, a process that can take years even in the smoothest of circumstances. Kyiv has long expressed its desire to join the military alliance but that's seen by many as a more provocative step than its bid to join the European Union.

"We understand that this requires the consensus of all members of the alliance," Zelensky said. "While this is happening, we offer to implement our proposals regarding security guarantees for Ukraine and all of Europe in accordance with the Kyiv Security Compact, which was developed and presented to our partners."

A leaders' statement from the North Atlantic Treaty Organization summit in Bucharest in 2008 has long left room for ambiguity over Ukraine. Leaders then welcomed the country's aspirations for membership, saying that Ukraine, along with Georgia "will become members of NATO."

Sweden and Finland most recently applied to join the alliance but their applications have faced hurdles from Turkey. Only after a country's application has been ratified by all allies do they enjoy collective defense benefits under Article 5.

Since Russia invaded Ukraine in February, NATO allies have supported Kyiv with military aid and training on a bilateral basis but have been careful not to intervene more formally as an alliance. They've also stepped up their presence on the alliance's eastern flank to deter any potential aggression from Russia.

Ukraine's announcement comes as Russia President Vladimir Putin declared four more occupied regions as part a Russia, formalizing one of Europe's biggest land grabs since World War II.

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