Publicly available data suggests that a Russian inspector satellite has shifted its position in orbit to bring it relatively close to a U.S. KH-11 spy satellite. Russia has a number of what it calls "space apparatus inspectors" in orbit, which the U.S. government and others warn the Kremlin could use to gather intelligence on other satellites or function as "killer satellites," using various means to damage, disable, or destroy those targets.
On Jan. 30, 2020, Michael Thompson, a graduate student at Purdue University focusing on astrodynamics, posted a detailed thread on Twitter about the Russian inspector satellite Cosmos 2542, also written Kosmos 2542, appearing to synchronize its orbit with a U.S. satellite known as USA 245, which is understood be one of the National Reconnaissance Office's KH-11 image gathering spy satellites. Russia launched this particular satellite from the Plesetsk Cosmodrome on Nov. 25, 2019, according to Space-Track.org, a U.S. government website that provides public data on space launches from the U.S. military's Combined Space Operations Center and the U.S.-Canadian North American Aerospace Defense Command. This is just one of a number of space apparatus inspectors and other curious satellites that the Kremlin has put into orbit over the past decade.
The Russian satellite recently moved into a new position where it has an especially good view of a US KH-11 spy satellite.