According to a report, Tim Cook said at an internal meeting that Apple would buy chips made in the US and Europe. According to the reported comments from Cook, Apple could start using those chips in around two years after buying out the plant in Arizona. As those plans become more apparent, Apple hopes to source from Europe.
Taiwan Semiconductor Manufacturing Company, or TSMC, is the main supplier of Apple's custom-designed chips. Most of the company's facilities are located in Taiwan, with an advanced facility being built in Arizona which will likely start producing chips in the year 2024.
There are options if Apple wants chips from the US.
Apple already does a lot of work with TSMC, so it makes sense that it will buy some chips from that facility. It is, however, not the only company building a facility there; Intel also has plans to build an additional Arizona factory, spurred on by the US government passing legislation to invest over $50 billion in domestic chip production. It seems unlikely that Apple will make it an important part of its chip strategy going forward, even though Intel has said it plans on producing chips for other companies. The company's cutting-edge tech is not as advanced as TSMC's, which was a factor in Apple's Silicon Transition for its Mac lineup
It isn't surprising that the company is looking into purchasing production capacity outside of Asia, regardless of which company makes Apple's chips in the US and Europe. Over the past few years, the company has been increasing its production of the iPhone in India. There are reports that it is doing the same thing for MacBooks, Apple Watches, and iPad as of 2020.