Rocky III and IV were basically Apollo's "Master Plan"
Ok, we all know had it not been for Apollo, Rocky would have certainly lost the fight against Clubber. Apollo, being the conceited guy that he is, would not have stood for that. That would mean he would have to fight Clubber one-on-one to prove (to himself) he was the best. Clubber was a stranger to him, mean-spirited, and would have laughed in his face. So Apollo built the Stallion back up to fighting strength so he could beat Clubber and retain his title.
Fast forward to Rocky and Apollo in the ring by themselves. The two films never actually show the fight between them, but later in Rocky IV it becomes apparent that Apollo didn't win (perhaps didn't lose either, could have been a tie). His unhealthy obsession of "proving to himself he is the best" is still unresolved.
Fast forward to Ivan Drago. At this point, Apollo probably knows that Drago is taking steroids and other "enhancing" drugs. He probably knows, deep down in the darkest places of his mind, that he cannot hope to beat Drago in the ring. He also knows that Drago's punching power is enormous. Notice how, before the fight, he says to Rocky "Maybe you don't know...what I'm talking about now...but you will when it's over. Believe me, you will when it's OVER!"
Apollo knew he was going to die. He knew this would be the catalyst that would launch Rocky into the most intense revenge-fight in boxing history. And, therefore, guaranteeing that Rocky would win against Drago and that Apollo would get the last laugh.
Or I'm completely wrong.