Ukrainian President Petro Poroshenko warned Sunday that, left unchecked, Russian aggression in his home country could spread to other areas of the world.

Russian-backed fighters invaded two parts of Ukraine last year, annexing the Crimean peninsula and firing mortars on Donetsk. More recently, Russians have moved military equipment and advisors to Syria, conducting airstrikes to support the regime of Syrian President Bashar Assad.

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Poroshenko said on CNN that there'll likely be more to come if the international community does not respond to the spreading violence.

"Fourth, maybe, I don't know, Afghanistan. Nobody knows where the Russian ... soldiers can appear," he said during an interview on CNN's "Fareed Zakaria GPS."

Asked if Ukraine should have closed its airspace amid reports that a Russian-made missile shot down Malaysia Airlines flight 17 near Donetsk, Poroshenko said he never imagined the Russians would bring weapons into the country that could shoot down planes flying higher than 32,000 feet.

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