Without disclosing details, the Air Force commander claimed kills on three Su-34s in response to Russia’s overnight “Shahed” attack. The downed jets are platforms for Kh-59 missiles and guided bombs.
Details are fairly scant at this point but the head of Ukraine's air force has confirmed it on telegram.
Since 2006 they've built 150 units. That's 8 units a year. Some were sold, some got lost.
As of 20 May 2023, there have been 20 visually confirmed cases of Su-34s being lost, damaged or abandoned by Russian forces since the start of the 2022 Russian invasion of Ukraine. 23 now, apparently.
At their price, with sanctions, with wear of the remaining ones, at this rate, they might not have any left very soon.
It would be 9 years, if only one linear factor was at play.
I believe it's multiple factors, though.
One is that every plane taken out had its share of "work", which is now distributed across the remaining ones. Which means they get worn out a little faster. Similar to how they have to cannibalise parts from one civilian aircraft to repair another.
Then I'm going they cannot maintain the usual production speed because if the sanctions. Add to that an increased need to repair since the plains are more heavily used. And I'd guess that repairs are fine at the same facility that produces them, this also reducing production speed.
In other words, I think it's about snowballing and at this rate it could be way less than nine years.