Russia is rattling NATO’s nerves, but how far will Moscow go?

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Special counsel Robert Mueller has closed his long and contentious Russia investigation with no new charges, ending the probe that has cast a dark shadow over Donald Trump's presidency but launching a fresh wave of political battles. (AP Photo/Pavel Golovkin)" width="620" />

Russia may not be preparing to invade NATO, but something more ambiguous could be coming.

Intelligence warnings point to provocations designed to rattle the alliance, sow confusion and test its resolve.

With uncertainty surrounding Washington’s response, Moscow may see an opportunity to probe NATO’s most vulnerable point: its political unity.