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The present report has been prepared by the international legal consultant – Irina Krasnova, professor of environmental law of the Russian Academy of State Administration under the President of the Russian Federation, doctor of juridical science.

The report is prepared within the framework of the Caspian Environment Programme in accordance with the relevant UNEP/UNDP/TACIS project, the Terms of Reference for the International Consultancy of Legal National Assessments attached in Annex III to the project and the Workplan for CRTC/LREI.

The article examines recent Caspian Sea level change by using both satellite radar altimetry and satellite gravity data. The altimetry record for 2002–2015 shows a declining level at a rate that is approximately 20 times greater than the rate of global sea level rise. Seasonal fluctuations are also much larger than in the world oceans. With a clearly defined geographic region and dominant signal magnitude, variations in the sea level and associated mass changes provide an excellent way to compare various approaches for processing satellite gravity data.