From the BBC:
"Russia having to resort to old artillery as it runs out of weapons
As we've been reporting, Russia is running short of modern weapons and is having to resort to using heavy anti-ship missiles in ground attacks against Ukraine - which are highly inaccurate and can cause significant casualties and collateral damage, the UK's defence ministry says.
We saw a few weeks ago during Russia's strikes on the southern city of Odesa they were using old soviet stock.
The analysis we're getting is that it's symptomatic of the Russians running out of weapons.
They've used up their more modern cruise missiles, they've used their more high-tech precision weaponry, so they're having to dig deep into the arsenals to find out what they have lying around.
I'm sure some Russians would dispute that - they'd say there are some tactical reasons for doing this, but it's quite likely, especially given the sanctions Russia is under, that a lot of its weaponry requires modern western technology imports to make new stocks.
So once they've used them all, given the sanctions they're under, maybe they have to resort to use old equipment."