Former military pilots are being lured to China with big cash offers to train the army

As many as 30 individuals who formerly served as pilots in the British armed forces have accepted requests to go to China to train members of its People’s Liberation Army, the BBC reported on Tuesday.

One Western official told the BBC that headhunts for pilots had drastically increased lately, adding that China was offering them “lucrative packages” thought to be worth as much as $270,000. Pilots from the U.K.’s ally nations have also been targeted, according to the report.

A spokesperson for the British Ministry of Defence confirmed to Fortune on Tuesday that former military pilots were indeed traveling to China to instruct members of the country’s army.

“We are taking decisive steps to stop Chinese recruitment schemes attempting to headhunt serving and former U.K. Armed Forces pilots to train People’s Liberation Army personnel in the People’s Republic of China,” they said.

“All serving and former personnel are already subject to the Official Secrets Act, and we are reviewing the use of confidentiality contracts and non-disclosure agreements across Defence, while the new National Security Bill will create additional tools to tackle contemporary security challenges—including this one.”

According to the BBC report, the U.K. government is issuing an intelligence alert to warn ex-military pilots not to accept job offers from the Chinese military. However, there is reportedly no evidence any of the pilots involved in the training scheme have broken the law.

Representatives for the Chinese government were not available for comment when contacted by Fortune.

U.K. officials have previously spoken out about seeing China as a threat to Britain.

Last week, the U.K.’s spy chief warned that Chinese technology posed a threat to British security and prosperity.

In July, British and U.S. intelligence officials said China “poses the biggest long-term threat” to national security for both their own countries and their allies.

Their joint alert came shortly after NATO chief Jens Stoltenberg warned Beijing’s efforts to build up its forces and “bully its neighbors” meant China represented “serious challenges.”

In recent months, the U.S. has faced off with Beijing over Taiwan and the semiconductor industry, and in President Joe Biden’s first formal national security strategy, China was named America’s “most consequential geopolitical challenge.”