See also the entire War of the Week, where SVT Nyheter deepens the latest news developments in the war in Ukraine, in eight minutes.

A warm spring can affect the war and in the next week it will be plus degrees at the front.  

- We could see for ourselves when we were in Ukraine a week ago up in Kupjansk, that the frost was coming out of the ground, says SVT's Ukraine correspondent Bengt Norborg.

Something that can make it difficult to move forward on the battlefield.

- If a tank or an armored vehicle weighs several tons, then you can easily realize that going on the offensive in the worst mud puddle will be difficult.

This is a short period that is not particularly suitable for moving forward, says SVT's Ukraine correspondent.