The Trump administration has escalated pressure on Moscow, formally demanding detailed information about the death of a researcher at a Siberian anti-plague facility and the subsequent quarantine measures, a source familiar with the matter told NewsNation.
The U.S. delivered a demarche—an official diplomatic communication expressing Washington's position—to the Russian government, signaling a more assertive push for credible answers about a potential outbreak of pneumonic plague, a highly contagious and often fatal disease.
A State Department spokesperson confirmed the move, stating, "We have officially requested additional information from the Russian government," and added that the U.S. is "also in official communication with other countries around the world to share information."
The demarche underscores Russia's obligations under the World Health Organization's International Health Regulations to provide timely and complete public health data on dangerous infectious threats, such as plague, to help assess and prevent international spread.
Secretary of State Marco Rubio told reporters on Tuesday that it is "incumbent" on Russia to share more details with the global community. While initial information from Moscow did not suggest immediate alarm, Rubio said, "it is cause for focus and a cause to just keep an eye on it, and we're doing that."
Rubio elaborated, "We know what we know, obviously, about whatever the Russians have provided, which is it seems that there was a worker at the lab that was infected, and there's concern that that could have spread, at least internally. So you've seen them do quarantines with this—of that nature." He cautioned, "But like anything else, something like that gets out, it could quickly spread. So we're watching and monitoring it closely."
The State Department also refreshed its travel advisory for Russia on Tuesday, reiterating its Level 4 "Do Not Travel" warning and noting that the U.S. has limited capacity to assist Americans in the country. This follows renewed concerns about the plague incident.
WHO Director-General Tedros Adhanom Ghebreyesus said Tuesday that his organization has been "actively following up" since the individual died after being hospitalized with severe pneumonia in Irkutsk oblast. He noted that initial media reports suggested pneumonic plague following an alleged accidental laboratory exposure. In response to a WHO verification request under the International Health Regulations, Russian health authorities reported that no plague case had recently been registered in the region, though the WHO has stated that the risk to the general population appears low.
Russian officials have tried to reassure the public in recent days, according to the Moscow Times. The deceased was a female employee of the Irkutsk Anti-Plague Research Institute of Siberia and the Far East, who was hospitalized last Tuesday with severe pneumonia symptoms and died on Thursday. The consumer safety watchdog Rospotrebnadzor described her condition as "pneumonia of unknown etiology," and nearly 200 people who had contact with her were placed under medical observation.
Rospotrebnadzor said laboratory tests on the patient did not reveal any microorganisms linked to her work with dangerous pathogens. However, the incident has raised global concerns, prompting further scrutiny from international health officials and direct pressure from U.S. leadership.
