Ukraine and Russia swapped soldiers who had entered each other's territory near the battlefield in eastern Ukraine, where Kyiv says Moscow's forces have come to the aid of pro-Russian insurgents advancing for an assault on a major port.
Russia's War Against Ukraine
Reuters: Moscow, Kyiv swap troops as Ukraine port girds for pro-Russian assault
Ukrainian border guards patrol near the small Ukrainian city of Novoazovsk, Donetsk Oblast on the border with Russia.
