Since Russia launched its attack on February 24, troops have flooded into Ukraine, and targets across the country have been hit by airstrikes and artillery attacks.
At the same time, Russian troops have failed to capture the capital Kyiv and other major cities.
The number of dead soldiers in the battles is difficult to verify.
According to the UN, at least 136 civilians, including 13 children, were killed in the war.
However, the organization emphasizes that the actual death toll is likely to be much higher.
Ukraine, for its part, says more than 2,000 civilians have been killed in the past week.
Since the invasion began, more than 835,000 people have left Ukraine, according to the UNHCR.
The EU estimates that up to four million people could try to leave the country due to the Russian invasion.