FILE - In this Thursday, April 14, 2016 file photo, Russian soldiers stand on a road as smoke rises from a controlled land mine detonation by Russian experts inside the ancient town of Palmyra, Syria. An American heritage organization says the Russian military is constructing a new army base in the central Syrian town of Palmyra, within the protected zone that holds the archaeological site listed by UNESCO as world heritage. (AP Photo/Hassan Ammar, File)