Russia is sitting on an enormous pile of fast growing foreign currency, especially dollar and euro, because of the immense trade surplus they are running while unable to spend much of it due to sanctions. With all of that they could easily pump up the value of the ruble much, MUCH higher if they wanted to.

But in fact the sweet spot is considered to be between 70-80. Anything too much stronger and it would be to Russia’s detriment because an export heavy economy benefits from a weaker domestic currency. So in fact Russia is having to work hard to prevent the Ruble from becoming too strong. Same reason why China will never give up its capital controls.

Ukraine is having the opposite problem by the way, their currency, battered by 8 years of neoliberalism and now with a war wiping out most of their economy, is on the verge of collapse and only being propped up some heavy manipulations (likely illegal) by the west in conjunction with Ukrainian oligarchs.