US President Barracks Obama said a new round of sanctions will continue to ratchet up the pressure on Russia.
The US leader said existing sanctions have already made the Russian economy even weaker.
He added: "If Russia continues on this current path, the costs on Russia will continue to grow."
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With temperatures peaking at 29C today, it is the hottest April day for nearly 70 years.
Russian trolls are behind a disinformation campaign about chemical weapons attacks in Syria and Salisbury, a government source has said.
Decontamination work is to begin at nine sites across the city.