Three Russian tanks have made their way into eastern Ukraine by way of a rebel-controlled checkpoint, according to Ukraine's interior minister, the BBC reports. Arsen Avakov says the tanks, along with armored troop carriers, entered via the Luhansk region then rolled into the adjacent Donetsk region, where they made way to the town of Snizhne; a Reuters correspondent reports seeing three tanks there. Per Avakov, two have since moved to the town of Horlivka, where Ukrainian forces engaged them and a "fight is underway." Russia has not commented on Avakov's accusations that it let the tanks cross. (More Ukraine stories.)