Ukrainian Presidential Advisor Mykhaylo Podolyak told the BBC Russian forces are throwing “pretty much everything non-nuclear at the front.”
The Russian President’s initial plan was to capture Ukraine’s capital, Kyiv, in a matter of days and force a regime change in the country.
At one point, Russian soldiers looked close to surrounding Kyiv but a series of Ukrainian victories in the north of the country pushed them back.
The focus now is in the east of Ukraine in the Donbas region where trench warfare has set in and troops from both sides are fighting hard to make incremental gains.
How many Ukrainian soldiers have died?
Ukraine says it has lost about 10,000 soldiers in total since the start of the war in February.
Mr Podolyak said Ukraine is losing 100 to 200 soldiers every day and several hundred more are being wounded.
However, these figures are thought to be at the lower end and the true number of casualties could be much higher.
Lawmaker David Arakhamia, Ukraine’s chief negotiator with Russia, told Axios last week that Ukraine is suffering up to 1,000 killed or injured soldiers everyday in the Donbas region alone.
Some of the bloodiest battles of the war took place in the city of Mariupol which was captured by Russian forces after a prolonged siege.
Petro Andryushchenko, one of the city’s officials, described the scene of the fighting as an “endless caravan of death”.
The frontline is now more than 2.5 thousand kilometres long according to President Zelensky who vowed to continue fighting until Ukraine regains its land.
He wrote on Telegram on Monday: “We are dealing with absolute evil. And we have no choice but to move on. Free our entire territory. Oust the occupiers from all our regions.”
Before the invasion, Ukraine’s Army was 125,000 troops strong compared to Russia which had about 900,000 active military personnel.
Ukraine’s army has grown considerably since then as its 900,000 reservists have joined the conflict.
Soldiers from around the world also travelled to Ukraine to join the fighting as part of Ukraine’s new Foreign Legion.
Volunteers from countries such as Belarus and Georgia have also joined the fight and formed their own divisions protecting Ukraine.