BEIJING/TOKYO--The U.S. ambassador to Japan questioned in a social media post on Friday whether China’s Defense Minister Li Shangfu had been placed under house arrest, adding to confusion about the state councilor’s more than two week absence from public view.

In a post on X, formerly Twitter, Rahm Emanuel wrote: “1st: Defense Minister Li Shangfu hasn’t been seen or heard from in 3 weeks. 2nd: He was a no-show for his trip to Vietnam. Now: He’s absent from his scheduled meeting with the Singaporean Chief of Navy because he was placed on house arrest???”

China’s foreign and defense ministries did not immediately respond to requests for comment. The U.S. embassy in Tokyo said it did not immediately have further comment.

Li, 65, abruptly pulled out of a meeting with Vietnamese defense leaders last week, Reuters exclusively reported on Thursday. He was last seen in Beijing on Aug. 29 delivering a keynote address at a security forum with African nations.

The U.S government believes Li has been placed under investigation, the Financial Times reported on Friday, citing three U.S. officials and two people briefed on the intelligence. The report did not state the nature of the investigation.

Li’s absence follows China’s unexplained replacement of its foreign minister, Qin Gang, in July after a prolonged period out of public view and a shake-up of the leadership of the People’s Liberation Army’s elite Rocket Force in recent months.

Like Li, Qin is one of China’s five state councilors, a cabinet position that ranks higher than a regular minister.

These moves have raised questions from analysts and diplomats about a lack of transparency in China’s leadership at a time when its economy is slowing and its relations with rival superpower the United States have soured over a range of issues.

MISSED MEETING

Emanuel, a gregarious and outspoken diplomat who served as chief of staff to former U.S. President Barack Obama, has hit the headlines for a series of fiery posts directed at China in recent weeks.

He first posted about Li’s public absence last Friday, fuelling a swirl of speculation on his whereabouts. Asked why Emanuel had weighed in on the issue, U.S. State Department spokesperson Matthew Miller said the ambassador “throughout his career has spoken in a colorful manner”.

The Singapore meeting Emanuel appeared to be referring to in his latest post was a visit by the Singapore Navy’s Rear Admiral Sean Wat to China from Sept. 4-9.

On the trip, Wat met with China’s Navy commander Dong Jun and other Navy leaders, Singapore’s defense ministry said on its website. Two sources familiar with the matter said Wat had also been expected to meet with Li.

One of the sources, an official with direct knowledge of the plans, said Wat was scheduled to meet with Li on Sept. 5 in Beijing but “it didn’t happen,” without elaborating.

Singapore’s defense ministry did not immediately respond to a request for comment.

‘ROADBLOCK’

Before Li was appointed to his post in March, he had headed the military’s procurement unit.

In a rare notice in July, the unit said it was looking to “clean-up” its bidding process and invited the public to report irregularities dating back to 2017. There has been no update on possible findings.

Li’s absence is being particularly closely watched by the U.S., which has refused to drop sanctions imposed on him in 2018 for buying weapons from Russia’s largest arms exporter, Rosoboronexport.

Chinese officials have repeatedly said they want those sanctions dropped to facilitate better discussions between the two sides’ militaries. U.S. Defense Secretary Lloyd Austin attempted talks with Li during a defense conference in Singapore in June, but did not get beyond a handshake.

Wen-Ti Sung, political scientist at the Australian National University, said while Li had been a “roadblock” in U.S.-China military relations his unexplained absence is problematic for China’s international relations in other ways.

“Other countries will be wondering something as basic as whose number to call when they want to set up military dialogues with China,” he said.