Yes, Russian had been also official language of Turkmenistan before and even after independence of Turkmenistan in 1991. But know there are 5% Russians who also speak Turkmen. It is better to learn Turkmen as a first priority and if you understand Russian that will make you able to talk almost 100% population.
Thanks for the participation. You are Turkmen and Turkmen is your language. Everbody has his own language.
Sometimes people like to learn a second language. Some people learn more than two languagrs. If someone likes to live in your great country then he must learn Turkmen langue so that he can communicate with other persons.