Russia's full-scale war on Ukraine has prompted a slew of difficult questions for a NATO alliance long confident of economic and military superiority over its historical eastern adversary.

The North Atlantic Treaty Organization (NATO/OTAN) was formed on April 4, 1949 in the wake of World War II and the beginning of the Cold War. Twelve countries signed onto the treaty, also known as ...

But what is Nato, and why is it central to the current conflict? The North Atlantic Treaty Organization, or Nato, is a political and military alliance of 32 countries "that exists to protect the ...