An analysis of Huawei’s latest series of smartphones, the Mate 70, found chips that showed little progress from those used in last year’s devices.

An intense struggle has unfolded in Washington between companies and officials over where to draw the line on selling technology to China.

Last year, a chip breakthrough put Huawei on top of the Chinese smartphone market. Now it is rolling out its newest phone, the Mate 70 series.

The Taiwanese chip giant will halt shipments to Chinese companies after some of its most advanced chips ended up with Huawei.

Sales for the iPhone maker were up 6 percent to to $94.93 billion. But a $14.4 billion tax bill cut profits that would have topped expectations.

The U.S. government has tried to keep Chinese companies from obtaining certain advanced technologies, but concerns have been growing that some products may have been routed to Huawei.