Russia says that a response to the new sanctions is "inevitable" and that the foreign ministry has summoned US ambassador to Moscow.
German authorities said that tests showed that Russian opposition politician Alexey Navalny had been poisoned with a chemical nerve agent from the Novichok group.
The bomb that is causing immeasurable human tragedy in Syria has also been used in the past.
As the outcome of the Warsaw summit suggests increased action against Russia in the Baltics, the Eastern Mediterranean, and the Black Sea, NATO Secretary-General Jens Stoltenberg is due to arrive in Turkey after visiting Georgia.
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