SCS Software have put out a statement about the Heart of Russia upcoming DLC for Euro Truck Simulator 2 and they've decided not to release it. With the ongoing barbaric invasion of Ukraine from Russia, it's not exactly surprising that releasing a DLC expansion for a game that's focused on Russia might cause problems.
In their statement, SCS mentioned how they "try to be as apolitical as possible" but in this case, they simply could not stay silent on it "with so many people suffering, we decided to refrain from releasing the DLC so that it is not perceived in any way as being in support of or tolerance of the aggression".
Sounds like it's not completely cancelled though, as they will hold onto it until Ukraine can "rebuild and heal" so they will then "endeavour to find a way for our Heart of Russia DLC to play whatever part it can in that healing process, for everyone".
A tough situation for SCS to navigate through, considering all the effort they put into their work and their DLC are usually quite well received too due to the work they put in to capture the essence of the areas they add in.