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PALMYRA, SYRIA - APRIL 18, 2017: A Russian military engineer uses a Scarabey remote controlled unmanned ground vehicle (UGV) during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS Federation/TASS (Photo by TASS\TASS via Getty Images)

PALMYRA, SYRIA - APRIL 18, 2017: A Russian military engineer uses a Scarabey remote controlled unmanned ground vehicle (UGV) during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS
Federation/TASS (Photo by TASS\TASS via Getty Images)

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PALMYRA, SYRIA - APRIL 18, 2017: A Russian military engineer uses a Scarabey remote controlled unmanned ground vehicle (UGV) during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS (Photo by TASS\TASS via Getty Images)

PALMYRA, SYRIA - APRIL 18, 2017: A Russian military engineer uses a Scarabey remote controlled unmanned ground vehicle (UGV) during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS (Photo by TASS\TASS via Getty Images)

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PALMYRA, SYRIA - APRIL 18, 2017: A Russian military engineer during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS (Photo by TASS\TASS via Getty Images)

PALMYRA, SYRIA - APRIL 18, 2017: A Russian military engineer during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS (Photo by TASS\TASS via Getty Images)

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PALMYRA, SYRIA - APRIL 18, 2017: A Scarabey remote controlled unmanned ground vehicle (UGV) is used by Russian military enginners during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS Federation/TASS (Photo by TASS\TASS via Getty Images)

PALMYRA, SYRIA - APRIL 18, 2017: A Scarabey remote controlled unmanned ground vehicle (UGV) is used by Russian military enginners during a mine clearing operation in Palmyra. Directorate of Media Service and Information of the Ministry of Defence of the Russian Federation/TASS
Federation/TASS (Photo by TASS\TASS via Getty Images)

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PALMYRA, SYRIA - MARCH 19, 2017: Sappers of the Russian Armed Forces International Mine Action Centre clearing Palmyra's historic and residential parts of mines. Russian Defence Ministry Press Office/TASS (Photo by TASS\TASS via Getty Images)

PALMYRA, SYRIA - MARCH 19, 2017: Sappers of the Russian Armed Forces International Mine Action Centre clearing Palmyra's historic and residential parts of mines. Russian Defence Ministry Press Office/TASS (Photo by TASS\TASS via Getty Images)