Lungdren and Lu (2006) analyzed RADARSAT-1 interferograms at Uzon caldera. They show that “from 2000 to 2003 approximately 0.15 m of inflation occurred at Uzon caldera, extending beneath adjacent Kikhpinych volcano”.
Pritchard and Simons present ERS-1 and -2 and RADARSAT data for northern Kamchatka between 1992 and 2003, although most volcanoes are only covered during the last three years. There is a complete list  of observations in the GSA Data Repository Item 2004139.
The Institute of Volcanology and Seismology (IVS FEB RAS) and Kamchatka Volcanic Eruption Response Team (KVERT) are responsible for monitoring volcanoes and providing aviation alerts.