<human>:  Why did Boris Yeltsin resign as president of Russia?
<bot>: Boris Yeltsin resigned in 1999 because of a conflict with the parliament. He wanted to be reelected as president, but the parliament refused to allow him to run again. The Russian parliament is the Federal Assembly, and it is a unicameral body, which means that it has only one chamber. The Federal Assembly is elected by the people of Russia, and it has more power than the president.