Conversation so far:
WHen was Boris Yeltsin's second term?
1996.
Are there any other interesting aspects about this article?
In 1998, a political and economic crisis emerged when Yeltsin's government defaulted on its debts.
What did he do during his second term?
During the 1999 Kosovo war, Yeltsin strongly opposed the NATO military campaign against Yugoslavia.

Question: What became of his opposition to NATO?
Self-contained rewrite: What became of Boris Yeltsin's opposition to NATO during the 1999 Kosovo war?