Fairly decent copies of our stuff. We have given them the technology to build such things by sending all our manufacturing to them. It’s going to bite us in the butt and our children will suffer for it.
Sell them stuff but NOT composite designs and materials, so while their aircraft may look like ours, they are ages behind.
Those are the consequences of Ayn Rand-style capitalism. Sell the chinks nuclear technology? Sell military secrets to them? Sure, anything for profit. Profit is the highest good, so making a profit can never wrong.