Could soccer diplomacy help usher in a breakthrough in Ukraine?
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Ukrainian President Petro Poroshenko and Russian President Vladimir Putin will attend Sunday’s World Cup final together in Rio de Janeiro, Brazil’s foreign ministry told the Associated Press.

It’s not certain if Poroshenko will arrive in time for a pre-game lunch hosted by Brazilian President Dilma Rousseff. Putin and other European leaders, including German Chancellor Angela Merkel are expected to attend.

Earlier Saturday, Poroshenko told Vice President Biden in a call that pro-Russian separatists were using heavy weapons to attack Ukranian forces. The U.S. and Ukraine have accused Moscow of providing that artillery and threatened to impose new sanctions if the supply is not halted.

Ironically, it’s not the first time soccer has served as the backdrop for high-stakes negotiations on Ukraine. 

In March, Secretary of State John KerryJohn KerryCongress needs to assert the war power against a dangerous president Sinclair and 'Big Media': The outrage that caused the outrage Tillerson sets a lost State Department on the right course MORE and Russian Foreign Minister Sergey Lavrov were photographed kicking a soccer ball around the U.S. ambassador’s house in London while discussing Russia’s decision to seize Crimea.