This number is being used as part of a wangiri scam originating in Russia. If you get any calls from the number +7 (940) 909-83-34 then don’t answer the phone.
You also need to protect yourself by not phoning this number back. Anyone who does so will be connected to an international premium rate line which will incur huge charges on your phone bill.
The term wangiri is a Japanese word meaning one-cut. This reflects the tactics of one-ring wangiri calls because they cut off the call in the hope the potential victim will ring back. Anyone who does so will immediately be connected to an extremely expensive premium rate phone line.