Why was the Russian army armed with outdated weapons?

Here you need to consider a specific period of time. The fact is that the Russian army often had outdated weapons. This was typical in those moments of history when a technical breakthrough occurred on the territory of the Western powers. When firearms, automatic weapons, engines, etc. were invented, it slowly reached the territories of modern Russia. While this weapon appeared in the army, other countries already had something newer and more advanced. All due to the fact that they were not particularly involved in the development of the military sphere.