Wars, as always, can create opportunities for some people or countries. However, these opportunities are often limited in the long run and the devastating effects of war are often outweighed by the economic and human losses felt around the world.
The Russia-Ukraine war may have created opportunities for some companies and countries. For example, some defense industry companies may profit from selling arms and other defense equipment to the warring parties. Also, some countries may find opportunities in this regard, as they are forced to reduce their gas purchases from Russia and turn to alternative energy sources.
I am not well versed in Ukraine and Russia war and I can't talk about that. But I remember clearly about USA vs Iraq war, one that was basically as terrible as it gets, hundreds of thousands of people dead, and a whole nation still not recovered because of the war.
Because America wanted to get rid of a dictator, if that was the only reason, they would have gone there, get the dictator, and leave. However, they stayed and derailed the whole nation and now people are starving and basically living in confusion there. Meanwhile, warhawks of USA made tens of billions of dollars from it, they just sold the trillion dollar war to congress and made a killing off it as well.