Ukrainian president Petro Poroshenko said the attack on the downed Malaysian Airliner is a "challenge to the whole world".
"Today's tragedy showed again that terrorism is notlocalised, but a world problem. And the external aggression against Ukraine is not just our problem, but a threat to European and global security," the president said on his website.
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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