In a Facebook post, Oleksandr Syrsky wrote that Russia is "actively attacking along the entire front line, achieving tactical successes in several sectors." "In an attempt to seize the strategic initiative and break through the front line, the enemy concentrated its main efforts in several sectors, creating a significant advantage in forces and means there," he explained. The Ukrainian army commander-in-chief reported "fierce battles" over the past week, describing a "dynamic" situation with certain positions changing hands several times a day. However, according to Oleksandr Syrsky, Ukrainian troops are managing to "improve their tactical position" in certain areas. Among the areas where fighting has been most intense is the Kupiansk sector in the northeast of the country, where the Russians "had partial success but were stopped." In the Kramatorsk sector (east), Russian troops are on the offensive to take the town of Chasiv Yar, but the "most difficult situation" is in the Pokrovsk and Kurakhove area, where "fierce fighting continues." Meanwhile, the Ukrainian army commander-in-chief indicated that Ukrainian troops have withdrawn from the towns of Berdychi, Semenivka and Novomykhailivka. ""To strengthen the defense in these sectors, brigades that have restored their combat capability are being deployed to replace units that have suffered losses," he explained. Oleksandr Syrsky also mentioned that the "situation remains tense" in the south of the country. Due to a lack of men and ammunition, Ukrainian forces have been facing a slow advance since the fall of the fortress city of Avdiivka in February. The commander-in-chief of the Ukrainian forces, Oleksandr Syrsky, had already admitted this month that the situation on the eastern front had "deteriorated significantly." On Monday, the head of Ukrainian military intelligence, Kyrylo Budanov, argued that the situation will worsen between May and June, which he described as a "difficult period" for Ukraine. In the last week, the situation has worsened following the sudden advance of the Russian army towards the village of Ocheretyne, a strategic high point northwest of Avdiivka, in the Ukrainian region of Donetsk, and the capture of several villages. In addition, they continue to advance towards Chasiv Yar, the eventual capture of which would allow the Russian army to threaten the Ukrainian strongholds of Sloviansk and Kramatorsk, which are essential for controlling the Donetsk region. Read Also: Two Ukrainians stabbed to death in Germany. Suspect is Russian (Portuguese version)