Why it matters
It is central to European security and to how the West responds to conflicts.
NATO in the news
More World terms
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Geopolitics
The way geography, resources and power shape relations and rivalries between countries.
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European Union
A political and economic union of European countries with a single market, shared laws in many areas and, for many members, the euro.
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Ceasefire
An agreement between warring sides to stop fighting, temporarily or as a step toward a lasting peace deal.