> It wasn't seriously discussed, and no concrete steps were taken, but there was speculation that Russia might join NATO eventually.

Concrete steps were, in fact, taken; with Russia both joining the NATO Partnership for Peace and hvaing a special cooperation deal wIth NATO, with various cooperation arrangements; it blew up when Putin wanted Russia to be admitted to NATO ahead of other Eastern European states, and without the political and other readiness criteriabeing used for other new members.