NATO doubled down Tuesday on its commitment to one day include Ukraine, a pledge that some officials and analysts believe helped prompt Russia's invasion this year, AP reports.

The world’s largest security alliance also pledged to send more aid to Ukrainian forces locked in battle with Russian troops.

U.S. Secretary of State Antony Blinken met with NATO foreign ministers in Romania to drum up support for Ukraine as Russia bombards energy infrastructure ahead to the frigid winter.

Russia cannot stop the alliance’s expansion, NATO leaders said. “NATO’s door is open,” NATO Secretary-General Jens Stoltenberg said before chairing the meeting in the capital, Bucharest.

He praised North Macedonia and Montenegro recently joining NATO, and said that Russian President Vladimir Putin “will get Finland and Sweden as NATO members” soon.

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