People attend a rally marking the 20th anniversary of the closure of the Semipalatinsk nuclear test site in Semei June 18, 2009. The poster reads, "20 years without nuclear tests". REUTERS/Shamil Zhumatov (KAZAKHSTAN ANNIVERSARY POLITICS) 

Kazakhstan's President Nursultan Nazarbayev walks in front of the monument "Stronger than Death", devoted to the closure of the Semipalatinsk nuclear test site, in Semei June 18, 2009. Kazakhstan marked the 20th anniversary of the closure of the Semipalatinsk nuclear polygon on Thursday. REUTERS/Shamil Zhumatov (KAZAKHSTAN ANNIVERSARY POLITICS) 

Kazakhstan's President Nursultan Nazarbayev sings the national anthem during a rally marking the 20th anniversary of the closure Semipalatinsk nuclear test site in Semei June 18, 2009. REUTERS/Shamil Zhumatov (KAZAKHSTAN ENERGY POLITICS ANNIVERSARY) 

Kazakhstan's President Nursultan Nazarbayev (R) attends a rally marking the 20th anniversary of the closure of the Semipalatinsk nuclear test site in Semei June 18, 2009. REUTERS/Shamil Zhumatov (KAZAKHSTAN ANNIVERSARY POLITICS) 

Kazakhstan's President Nursultan Nazarbayev (R) greets residents as he attends a rally marking the 20th anniversary of the closure of Semipalatinsk nuclear test site in Semei June 18, 2009. REUTERS/Shamil Zhumatov (KAZAKHSTAN ANNIVERSARY POLITICS) 

Kazakhstan's President Nursultan Nazarbayev waves in front of the monument ?Stronger than Death?, devoted to the closure of the Semipalatinsk nuclear test site, in Semei, Kazakhstan June 18, 2009. Kazakhstan on Thursday marks the 20th anniversary of closure of the Semipalatinsk Nuclear Polygon. REUTERS/Shamil Zhumatov (KAZAKHSTAN ANNIVERSARY POLITICS IMAGES OF THE DAY)