In general, foreign air carriers are prohibited from operating international charter flights to/from Kazakhstan, unless otherwise provided by international treaties or approved by the Civil Aviation Committee.  
"Article 40. Flights of aerial vehicles of foreign states in the air space of the Republic of Kazakhstan [...]
 4-1. Performance of international occasional (single) flights, linked with commercial airborne transportation, formed in the territory of the Republic of Kazakhstan by civil aerial vehicles of foreign air operators shall not be allowed, unless otherwise provided by the international treaties of the Republic of Kazakhstan or permits issued by the authorized body in the scope of civil aviation. [...]" (Law On Use of Air Space of the Republic of Kazakhstan and Aviation Activity (No. 339-IV of 15 July 2010), as amended by Laws No. 132-V of 4.7.2013 and No. 239-V of 29.9.2014, Article 40 [unofficial translation])
Law On Use of Air Space of the Republic of Kazakhstan and Aviation Activity (No. 339-IV of 15 July 2010), as amended by Laws No. 132-V of 4.7.2013 and No. 239-V of 29.9.2014, Article 40
[<a href="https://adilet.zan.kz/rus/docs/Z100000339_">Law</a>]