Several international airlines announced their planes will avoid flying over Ukraine after a Malaysia Airlines passenger plane came down in the east of the country where government forces are fighting pro-Russian separatists.
Germany's Lufthansa, Russia's Aeroflot, and Turkish Airlines were among the major airlines saying they will divert their flights
The French government advised French airline companies to also avoid Ukrainian airspace.
Dutch Prime Minister Mark Rutte said he was urgently returning to the Netherlands from an EU summit in Brussels to deal with the crisis.
The Malaysian airliner, with almost 300 passengers on the board, was shot down in Ukraine’s east, near Russian border.
Both the government in Kiev and the pro-Russia separatists who have been fighting in the Donetsk region denied any responsibility for downing the plane, which was carrying 295 people.