Prime Minister David Cameron said he told Russian President Vladimir Putin that the world was watching his response to the Ukraine plane disaster and waiting for him to do what he could to open the wreckage site to international investigators.
He also said he was hoped Russia would change its stance over the crisis in Ukraine, and would stop the flow of weapons and troops into the hands of separatist fighters.
He said there is strong support and co-operation within the EU to impose sanctions on Russia, depending on how they respond over the coming days.
Thousands of online users have taken to social media to call for the victims of the Malaysian airliner crash to be returned to loved ones.
United States intelligence officials admitted that they do not know who fired the surface-to-air missile that downed flight MH17.
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