Russian servers?

About 2 years ago, I had 20-30 ping on moscow servers, just like in CPMA. Then, it went up to 50. Then it started fluctuating between 50,60-70 and 85. For about a week now, my ping has gone up to 100-120.

Why do I have better ping to a server which is located in a place where you can throw boiling water out of an apartment building and watch it freeze to snow mid-air (Sibiria).

Siberia: 75-85

Moscow: 100-140 and it keeps rising

This makes it impossible to play with eastern russians in decent conditions in a cup (for example 125fps) hint hint nudge