A formal complaint has been issued to Russia by the US regarding its response to a suspected death related to a plague lab. The State Department has taken official action, requesting more information on the matter.

Further details about the complaint and the incident that prompted it are available from the source. The State Department's request for information is a formal step in seeking clarity on the situation.

The US action indicates a desire for greater transparency and cooperation from Russia regarding the suspected death and its connection to the plague lab.