The INF Treaty was signed at a time when the US and the USSR were the world’s dominant military powers and nobody else even came close.
Today, it is China that is undoubtedly the world’s second strongest conventional military Power. And while the US still retains dominance in the South China Sea according to reputable analysts (e.g. RAND), its margin of superiority is shrinking year by year.
Subscribing to this Cold War relict of a treaty is increasingly ruinous for the US, which requires more and more aeronaval assets to balance China. It will become completely unsustainable in the coming age of hypersonic missiles.
Russia breaking the INF is merely a convenient cover story.
That said, given NATO’s relative strength in air assets, the death of the INF will be beneficial for Russia as well, at least so far as a potential European theater is concerned.