(CNN) The Trump administration is stepping up its efforts to target China over economic espionage, simultaneously announcing a new initiative to combat trade theft and charges involving alleged crimes against an Idaho semiconductor company.

The Department of Justice unsealed an indictment Thursday alleging a state-backed Chinese firm, a Taiwanese company, and three Taiwanese individuals committed conspiracy to steal trade secrets from Micron, which makes memory chips.

"Chinese economic espionage against the United States has been increasing — and it has been increasing rapidly. We are here today to say, 'enough is enough.' We're not going to take it anymore," said Attorney General Jeff Sessions at a press conference.

It came as US President Donald Trump held his first phone conversation in months with Chinese leader Xi Jinping, amid rising economic and political tensions between the two major powers.

The two leaders discussed trade tensions as well as the ongoing efforts to smooth relations with North Korea, in a chat described by Trump as "long and very good."

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