What is NATO and how is it responding to Putin's invasion of Ukraine?

NATO Secretary General Jens Stoltenberg (c) at the start of an extraordinary virtual summit of NATO heads of state on 25 February, 2022 Source: EPA
A key reason behind Russia’s invasion of Ukraine is its neighbour's efforts to join NATO - a western military alliance led by the United States. Moscow sees it as a red line and while Kyiv has been adamant it wants to become a member, in recent days, it's hinted it may not want to join after all.
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