From The BBC:Russia has confirmed Nato has expelled two of its diplomats from Brussels, reportedly in retaliation for a spy scandal involving an Estonian official.
In a statement, the Russian foreign ministry described the expulsions as "outrageous" and a "crude provocation".
Nato diplomats claimed the Russians were undercover intelligence agents.
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More News On This NATO - Russian Diplomatic Spat
Russia says NATO expulsions a "crude provocation" -- Reuters
Russia slams NATO for envoys' expulsion -- The Age
Russians expelled in Nato spy storm -- Financial Times
My Comment: A day after NATO and Russia resumed formal contacts, diplomats are expelled. I call this bad timing if your intentions are to open up relations and to discuss issues that both parties can cooperate on.
This sends out the wrong message in every possible way.