The situation in the city of Bakhmut, on the eastern frontline, is becoming "more and more difficult", Ukraine's President Volodymyr Zelensky has said.
Russian forces have been trying to take the city for over six months. 1688เช็กชี่เกม
"The enemy is constantly destroying everything that can be used to protect our positions", Mr Zelensky stated.
The Ukrainian leader's remarks came as US Treasury Secretary Janet Yellen warned China against arming Russia during a visit to Kyiv on Monday.
Some of the fiercest fighting to take place since Russia invaded Ukraine just over a year ago has taken place in Bakhmut, in Ukraine's Donetsk region, part of which is under the control of Russia and its separatist allies.