Why doesn't Russia destroy the bridges over the Dnieper River?

It is becoming abundantly clear that Russia are deliberately taking a slow approach to winning their Special Military Operation against Ukraine.,

They are slowly bankrupting European countries who are supporting Ukraine financially and with weapons bought from the US and their own stockpiles.

Russia will eventually defeat Ukraine militarily and defeat Europe financially.

This is one of the reasons Russia decided not to destroy the bridges over the Dnieper River where all military equipment must enter the east of Ukraine.

The bridges across the Dnieper should have been the first target since February 2022 as any military expert would confirm.

The reason Russia has not can only mean that they are not only draining Ukraine of weapons and manpower but also deliberately draining European countries economies and their stockpile of weapons.

Russia has an abundance of hypersonic and advanced weapons that the US and Europe do not yet possess.

Russia will defeat Ukraine and its allies before the West catch up with Russian military technology.

(Although, when the West do catch up Russia will have advanced further with new types of weapons so will always have the advantage).

But to play it safe, Russia will defeat Ukraine when the circumstances are most advantageous to Russia and the least advantageous to Ukraine and its NATO and European allies.

When that will be only Russia knows.