Russia is holding live missile drills and flight missions in the Norwegian and Barents seas at a time when NATO is conducting its largest drill in the region since Cold War.
Russia's Foreign Ministry said on Friday it had every reason to believe Kiev was responsible for the death of eastern Ukraine rebel leader Alexander Zakharchenko.
The US government says it will not accept Russia's annexation of the Crimean peninsula from Ukraine.
The Organisation of the Prohibition of Chemical Weapons said on Saturday the mission visited "one of the sites" in Douma, where at least 40 killed in a suspected gas attack on April 7, and would draft a report based on the findings.
NATO Secretary-General Jens Stoltenberg said in a statement Moscow's behaviour is "destabilising and dangerous," while allies in the West condemned the nerve agent attack and called on Russia to "address all questions" related to the issue.
"Have they started blaming Russia yet for the Washington staff changes?" Russian Foreign Ministry Spokeswoman Maria Zakharova tells reporters, while Germany's deputy foreign minister expresses concern at the departure of Rex Tillerson.
Prime Minister Theresa May said it is "highly likely" that Moscow was responsible for the poisoning of former Russian double agent Sergei Skripal and his daughter. Russia called May's statement a "circus show."
As the common enemy in Syria is almost defeated, US and Russian-backed proxies have clashed in some areas. Their struggle to consolidate power has surfaced, but some analysts think the various actors have already claimed their spheres of influence.
Special Counsel Robert Mueller indicts 13 Russian nationals and three companies accused of running a secret campaign to tilt the 2016 US presidential election.
Ministry spokeswoman Maria Zakharova says those killed in Syria are not Russian service personnel.
Russian Foreign Ministry spokeswoman Maria Zakharova said in a statement that the diplomats will fulfill their duties from the Saudi capital, Riyadh.
Russia's foreign ministry called the search of a Russian diplomatic building in Washington an "unprecedented aggressive action" as bilateral relations hit a new post-Cold War low.
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