KHARKIV OBLAST, UKRAINE - JANUARY 7: A Ukrainian infantryman keeps the watch in the trenches on the front line, which is considered as 'zero', in the direction of Kupiansk, where clashes between Russia and Ukraine continue to take place, in Kupiansk city of Kharkiv, Ukraine on January 7, 2024. As temperatures drop to minus 15 during the day and as low as minus 25 at night, the Ukrainian soldiers keep their positions under the harsh winter conditions. Ozge Elif Kizil / Anadolu