“Shocking: On 11 September, 17 years after terrorist attacks in New York, the US proves its support for terrorism and conflicts”. The US threatens Syria with a strong reaction in case of a chemical attack. In fact, the accusations concerning “two previous chemical attacks” have never been proven, and the Chemical Weapons Organization did not agree that Damascus has used prohibited weapons.
During the last decades, neither Russia nor the Soviet Union has been engaged in extrajudicial killings; neither in the territory of Russia, nor abroad.
Killing opponents of the regime was a practice familiar to the USSR, see e.g. the case of Leon Trotsky. There has also been a case of murdering a former Russian spy already - in 2006, Alexander Litvinenko was poisoned by two Russians in London. As the UK public inquiry has found, "the FSB operation to kill Mr Litvinenko was probably approved by [Nikolai] Patrushev [head of the security service in 2006] and also by President Putin”: https://www.theguardian.com/world/2016/jan/21/alexander-litvinenko-was-probably-murdered-on-personal-orders-of-putin