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They describe themselves as the 227th Battalion of the 127th Brigade and brought the blue and yellow border post with them: These pictures are intended to show soldiers of the Ukrainian army in the Kharkiv region on the border with Russia.
The Ukrainian Ministry of Defense published them on Monday night on its Facebook page, the images cannot be independently verified.
However, they appear to demonstrate what is also being observed elsewhere in north-eastern Ukraine: the withdrawal of the Russian army.
Like in this village near Kharkiv.
Oleksandr Vilchinskiy, Ukrainian soldier: "After a decisive artillery attack, the Russians left very quickly. They didn't have time to do much looting. We saw what we believe to be their headquarters here, their TV sets and other things. Many positions were abandoned, Flak jackets and helmets are lying around."
The Russian soldiers would not have had time to mine the village as usual before leaving.
They are stationed two kilometers away.
In eastern Ukraine, Russia is currently concentrating militarily on the areas near Donetsk and Luhansk.
However, according to the regional governor, the Ukrainian army still controls around ten percent of Luhansk.
The use of newly delivered US weapons seems to be helping the Ukrainian army.
This video released by the Ukrainian army on Sunday is said to show an M777 howitzer on the front line in eastern Ukraine.
The US Embassy, in turn, posted these footage of Ukrainian soldiers training with weapons on Twitter.
Meanwhile, joy for other reasons in the town of Kalush: the residents there are celebrating the victory of their band Kalush Orchestra in the Eurovision Song Contest.
Petro Yugan, Kalush resident: "I love Kalush with all my soul. My wife and I watched until 1 a.m. and we were happy with the win. I was thrilled. I was in seventh heaven as I was very worried about my boys did. But I also want us to end the war as soon as possible, that would be an even bigger victory."
Regardless of the war, Ukraine wants to host the ESC in its own country next year.