GENEVA, Jan. 24 (Xinhua) -- The World Health Organization (WHO) chief said on Saturday that the reasons given by the United States for its decision to withdraw from the WHO are "untrue."

Tedros Adhanom Ghebreyesus, WHO director-general, made the remarks on social media platform X. He warned that the move will make the United States and the world "less safe."

The United States, which announced its withdrawal from the WHO a year ago, has yet to pay its outstanding membership dues, a WHO press official has confirmed.

"As of today, the USA has not paid the invoiced amounts for its assessed contributions for the biennium 2024-2025," a WHO press official said in an email to Xinhua on Wednesday.

According to a recent report by the National Public Radio (NPR), a U.S.-based media organization, the overdue sum totals approximately 278 million U.S. dollars.

The formal withdrawal of the United States is on the agenda of the WHO's upcoming Executive Board meeting, the official added, noting that the WHO Secretariat "will act on advice and guidance of our governing bodies accordingly."

On Jan. 20, 2025, U.S. President Donald Trump signed an executive order to withdraw the country from the WHO. The United Nations received the formal notice two days later.

Under the organization's charter, the withdrawal takes effect one year after notice is given. ■