NATO announced on Monday that some member countries are putting forces on standby and sending additional ships and fighter jets to eastern Europe as the United Kingdom and the United States ordered diplomats' families to withdraw from Ukraine amid concerns of a Russian invasion.
The developments underscore growing fears of a possible Russian incursion, following months of military maneuvering by Moscow that has set off a tit-for-tat series of escalations with NATO, a military alliance of Western powers.
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NATO allies put forces on standby as tensions rise over Ukraine crisis - CNN