Final answer:
Vladimir Putin became the president of Russia following Boris Yeltsin's resignation in 1999.
Step-by-step explanation:
The president of Russia who followed Boris Yeltsin after his resignation in 1999 was Vladimir Putin. Putin served as the Prime Minister under Yeltsin and assumed the presidency when Yeltsin stepped down. He then went on to serve multiple terms as president, making him one of the longest-serving Russian leaders.
Learn more about Presidents of Russia