Boris Yeltsin got so drunk during a visit to Washington in 1995 that Secret Service agents found him standing on Pennsylvania Avenue clad only in his underwear and trying to hail a cab so he could fetch a pizza.

That was among the indiscretions revealed in a new "oral history" of Bill Clinton's presidency, based on 79 taped interviews between Mr Clinton and the historian Taylor Branch in late night visits to the White House family quarters.
...

Mr Clinton also told of how a late night drinking binge by Mr Yeltsin during a visit to Washington in 1995 almost ended in an international incident when the Russian President, dressed only in his underwear, was found in the street by US Secret Service agents.

"The next night, Yeltsin eluded security forces again when he climbed down back stairs to the Blair House basement," the [USA Today reported.]

"A building guard took Yeltsin for a drunken intruder until Russian and US agents arrived on the scene and rescued him."