At least one Ukrainian armored vehicle has crossed the Russian border with Ukraine and stopped in the Rostov Region, according to Russia’s Security Service. The Ukrainian armored vehicle stopped in near the village of Millerovo, said Vasily Malaev, the head of the press department of the Federal Security Service (FSB) in Rostov Region, on Friday. In response to the incident, the Russian Foreign Ministry said the “illegal act” will not promote a peaceful resolution of the conflict. The ministry has also demanded an end to such “provocations” on the border, which are making dialogue between the two countries much more difficult. The ministry directed a protest note to Kiev on Friday. There are also reports that there was not one, but two armored vehicles. A source from the FSB told LifeNews Channel that two armored vehicles crossed the Russian border. Initially just one APC entered Russian territory, however it broke down, LifeNews was told. It was discovered by the Border Service, however, Russia’s troops failed to take the Ukrainian military personnel captive as another armored vehicle came to the rescue from Ukraine’s Luhansk Region. After that the Ukrainian troops fled the territory, returning to Ukraine, leaving the disabled vehicle behind in Russia. In response to the incident, the Ukrainian Border Service said that the military was surrounded by self-defense forces so they were forced to cross the Russian border to reach new locations of their units, NTV channel reported. Border authorities also assured that all 26 border officers returned to Ukraine via another checkpoint. Earlier on Friday, NATO warned that if reports that Russian tanks have breached the Ukrainian border are confirmed, it would be serious escalation of the conflict.