China's innovation relies on the stolen western IP, without it, China is nothing. Also USSR/Russia is no longer a scientific powerhouse that can supply China with some military innovation. A dictatorship combined with cheap labour it 100% guarantees that the country's innovation is stunted, no matter what the Chinese propaganda claims.
Nowadays, China produces about the same amount of high-quality R&D as the US does.
Your view of China is several decades out of date. Chinese labor isn't even that cheap any more. China is moving up the value chain and outsourcing production that needs cheap labor to poorer countries (or replacing workers with robots altogether).
Corporate espionage is ever present but it is criminalized. The only time US as a country did that you can say "stole IP" was after WII when it took Nazi rocket scientists and technology.
China is the opposite; stealing tech is done by the state apparatus (same was done by USSR and reverse engineering computers for example).
Frankly I'm not surprised that this is done, probably if US was so behind it would have done the same to reduce the gap. Everyone is trying to survive and outsmart and outwit the other, instead of collaborating.
Also during World War I the American government seized German chemical patents thereby launching the American chemical industry. So that is an example of theft by the state apparatus.
After it took over and solidified itself as the world leader at it of course there was no need to steal IP anymore, most of it is registered there already and to the benefit of their nation. I'm sure people a hundred years from now will be having similar conversations if china or someone else takes the us's place and naturally starts caring about IP(and the runner ups stop caring).