Updated

President Biden signed documents backing the entry of Sweden and Finland into the North Atlantic Treaty Organization (NATO) on Tuesday.

"Putin thought he could break us apart… weaken our resolve," Biden said during a news conference announcing U.S. ratification of expanding NATO to include Finland and Sweden. "Instead, he’s getting exactly what he did not want. He wanted the Findalization [Finland-ization] of NATO, but he’s getting the NATO-ization of Finland."

Before signing the documents, Biden touted the expansion as a "watershed moment" that would enhance the security of "not only Europe and the United States, but of the world."

Biden urged the rest of the NATO allies to quickly ratify the expansion as well, noting the shared values Finland and Sweden have with the 30-member alliance.

"Sweden and Finland have strong democratic institutions, strong militaries, and strong and transparent economies that will meet every NATO requirement," the president said.

Finland and Sweden's membership will be the first significant expansion of the alliance since the Soviet Union's collapse in the 1990s. Their acceptance into the bloc marks a rebuke to Russia amid its ongoing invasion of Ukraine.

The Senate approved the move in a rare showing of bipartisan support, voting 95-1 last week in favor of the expansion. Sen. Josh Hawley, R-Mo., was the only senator to vote against the measure, arguing that it would take focus away from China, which he considers America's primary geopolitical foe.

NATO MAKES THE RIGHT CALL ON SWEDEN, FINLAND IN A BIG, BOLD MOVE

Joe Biden, in a suit with a striped tie, speaks before a NATO logo behind the presidential seal

President Joe Biden holds a press conference. (Fox News )

"We can do more in Europe... devote more resources, more firepower ... or do what we need to do to deter Asia and China. We cannot do both," Hawley said, according to the Associated Press.

But Senate Minority Leader Mitch McConnell welcomed the news, arguing that the move would boost national security.

"Their accession will make NATO stronger and America more secure. If any senator is looking for a defensible excuse to vote no, I wish them good luck," McConnell said.

Biden immediately signalled his support for the measure after the Senate vote. 

"I look forward to signing the accession protocols and welcoming Sweden and Finland, two strong democracies with highly capable militaries, into the greatest defensive alliance in history," Biden said in a statement last week after the Senate overwhelmingly approved their membership.

Finland and Sweden's application to join NATO came in response to Russia's invasion of Ukraine in February, with membership in the alliance being strongly opposed by the Kremlin.

World leaders appear at a NATO meeting on expansion for Finland and Sweden

From left to right background: NATO Secretary General Jens Stoltenberg, Turkish President Recep Tayyip Erdogan, Finland's President Sauli Niinisto, Sweden's Prime Minister Magdalena Andersson, Turkish Foreign Minister Mevlut Cavusoglu, Finnish Foreign Minister Pekka Haavisto, and Sweden's Foreign Minister Ann Linde sign a memorandum in which Turkey agrees to Finland and Sweden's membership of the defense alliance in Madrid, Spain on Tuesday, June 28, 2022.  (AP Photo/Bernat Armangue)

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NATO's 30 current member-states signed the accession protocol for the two countries last month, clearing the way for the members to formally ratify their membership.

All 30 current NATO members must ratify the decision to allow Finland and Sweden's membership before they can be protected by Article Five of the NATO Charter, which states an attack on one NATO country is an attack on all members.

Canada, Germany and Italy have already ratified the accession of the two countries.