It is known that the Russian Post Service (Почта России) is notoriously unreliable and slow. What are some other reliable, cheap and fast ways to send mail (envelope of documents or light parcel of small customs value) to private address in Russia from the EU?

It is known that the Russian Post Service (Почта России) is notoriously unreliable and slow. 

What are some other ways to send mail (envelope of documents or light parcel of small customs value) to private address in Russia from the EU? What are their performance regarding reliability and speed?

It is known that the Russian Post Service (Почта России) is notoriously unreliable and slow. What are some reliable, cheap and fast ways to send mail (envelope of documents or light parcel of small customs value) to private address in Russia from the EU?

It is known that the Russian Post Service (Почта России) is notoriously unreliable and slow. What are some other reliable, cheap and fast ways to send mail (envelope of documents or light parcel of small customs value) to private address in Russia from the EU?