In another case unveiled Tuesday, a California-based engineer is accused of trying to steal source code for advanced machinery that can be used to make parts for military submarines and aircraft to sell it to several Chinese companies.

Two other cases were announced, including charges against China-based agents who were accused of attempting to send materials used in weapons of mass destruction to Iran, according to U.S. officials, and charges involving the alleged provision of advanced technology to Russia that could be repurposed by the Russian military.

Matthew G. Olsen, the assistant attorney general of the Justice Department’s national security division, told reporters that the cases showed the U.S. government’s ability “to accelerate investigations and surge our collective resources to defend against these threats.”

“Foreign nation states are working hard to acquire our most sensitive technologies,” said Matthew Axelrod, the assistant secretary for export enforcement at the Commerce Department’s Bureau of Industry and Security. “We’re working even harder to stop them.”

Oleg Patsulya and Vasilii Besedin, the two Russian nationals who were arrested last week under suspicion of trying to procure millions of dollars of prohibited parts for Russian airlines, were charged with conspiracy to violate the Export Control Reform Act and conspiracy to commit international money laundering. If convicted, they would face up to 20 years in prison for each charge.