Russia, even now, isn't like Iraq, etc. they have capable air defence platforms and fighter aircraft, etc.
Russia's biggest mistake was not getting air superiority early in the war but between the realistic state of their air fleet and a seeming lack of institutionalised knowledge and experience of complex large scale air operations, combined with Ukraine's air defences not being comprehensively dismantled in the early strikes, it doesn't seem like it was actually possible for them to do so.
Ukraine has a variety of land based platforms which can fire at targets miles away and scoot - they've been using helis and to a lesser extent aircraft to lob dumb rockets in a mobile artillery style role due to a lack of mobile artillery systems available but more stuff is being supplied in that regard.
Russia is also somewhat handicapped by the focus over the years mostly being on an all out war with the West - their air defence and aircraft don't do so well in a complex situation like this with still having to have consideration for civilian air traffic and other nation's borders - if Ukraine escalates in the air we will start to see stuff like Russia's S-400 complexes come into play and for all their failings they are not as much of a joke as this situation so far has got people thinking.
Ukraine will need a far larger and more sophisticated air capability to do much more than what they are doing now of extreme low flying, high risk, missions - more than having a few dozen extra older aircraft, especially mixed ones, will provide.