Ukraine is struggling to hold back a major Russian incursion near its second biggest city of Kharkiv.
Thousands of people are fleeing their homes in the northeastern region, as missiles routinely target the area.
The cross-border offensive is one of the most significant Russian ground attacks since the start of the war.
During a surprise visit to Kyiv on Tuesday, US Secretary of State Antony Blinken told President Volodymyr Zelensky that military aid is "now on its way".
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