The formal cause of the destruction is the Russian invasion, the efficient cause might be Ukrainian artillery, or it might be Russian airstrikes, as the article

The formal cause of the destruction is the Russian invasion, the efficient cause might be Ukrainian artillery, or it might be Russian airstrikes, as the article indicates. It's a useful distinction, and I wager most people would consider the efficient cause to be the appropriate cause in a sentence like "object destroyed by causal subject". Otherwise we end up with difficulty parsing "Russian MiG destroyed by Russia", are we saying it's all Russia's fault, or that Russian forces shot their own jet?