This article delves into multi-domain operations in the context of future warfighting. A multi-domain approach to operations is being progressively implemented in allied nations and within NATO, as well. It should also become a core interest for the Czech Republic, even if the sea and space domains do not represent the crucial area of potential operational engagement of the Army of the Czech Republic. The complexity of operations in a complex operating environment requires mutual interaction across all operational domains. The integration of the physical and virtual spheres of operations suggests that operations planning cannot be strictly oriented to individual operational domains. The interaction between operational domains must be perceived as a sine qua non for effective planning and conducting military operations. This is also a fundamental prerequisite for the successful activity of forces in a complex operating environment.