To purchase USDT for rubles, use USDT exchangers
USDT/BUSD Calculator Tether to Binance USD
Price of 1 Tether today (11 February)
BUSD 0.9984
0.0184%
USDT 
BTC
USD
RUB
EUR
GBP
ETH
LTC
BCH
BNB
BUSD
SOL