NATO renews membership vow to Ukraine, pledges arms and aid

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. 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 going into the frigid winter. Russia cannot stop the alliance’s expansion, NATO leaders said.

“NATO’s door is open,” NATO Secretary-General...