Greek Prime Minister Alexis Tsipras, who returned to power after Sunday's election, called for "shared" European responsibility in tackling the migrant crisis facing the bloc.
The EU congratulated Alexis Tsipras on his left-wing party's re-election victory and said Greece has "no time to lose" in implementing the reforms agreed as part of its international bailout.
Alexis Tsipras is a six-year-old with a broken left arm and Greece's leading female politician changes a tyre in high heels while refusing to pay the country's debt.
The United States has asked Greece to ban Russian supply flights to Syria from its airspace, amid growing US fears that Moscow is increasing its military backing for Syrian President Bashar al-Assad.
The Greek island of Lesbos is "on the verge of explosion" with violence erupting as the more than 15,000 mainly Syrian refugees push local resources to the limit.
Greece's former leader Alexis Tsipras has opened the door to a coalition with rivals on the left should his Syriza party fail to win a majority in elections in two weeks' time.
Europe is facing an "unprecedented humanitarian and political crisis" as it struggles with the huge influx of refugees and migrants, the European Commission's vice-president Frans Timmermans said.
Greece's ex-prime minister Alexis Tsipras called for voters in upcoming snap elections to give his radical left Syriza party a "strong mandate" to lead the crisis-hit nation.
Greece geared up for a snap election next month, with an opinion poll showing the leftist party Syriza ahead despite a wave of defections over the country's massive new bailout.
A breakaway eurosceptic faction of Greece's Syriza party was to attempt to form a government as the country headed for a likely September 20 snap ballot.
Macedonia said it would allow a limited number of "vulnerable" migrants to enter the country after sealing its border with Greece to them, leaving thousands of refugees stuck in no-man's land.