Earlier quoted context omitted.
The ruble is so strong because russia cannot spend money anymore because of sanctions. I'm living in Germany, the biggest problem is the inflation caused by energy prices. It's still lower than in the US or the UK, but people are starting to struggle. Business is going well as Germany is mostly export-driven, but companies don't want to give out rises.
The rouble is strong because the Russian state is burning through its foreign reserves to backstop it.
Half of Russia’s reserves are sanctioned. They’re earning bumper returns on their energy exports, mainly oil, despite the ~20% discount they’re forced to offer. And they’ve been seizing exporters’ hard currency.
They say they’re down 10% (20% sanctions adjusted) from February [1]. That’s a decrease, but it’s not burning. (Obvious disclaimer: they’re probably lying.)
[1] https://tradingeconomics.com/russia/foreign-exchange-reserve...