They don’t share territory currently, so no. Even before they barely shared territory, looking at some maps there is only slight overlap with the most eastern lions and most western tigers. Not sure if they shared that small overlap at the same time either.
Not really experiments carried out by humans, more of a didn’t prevent it from happening.
But lions and tigers don’t breed naturally, do they?
They don’t share territory currently, so no. Even before they barely shared territory, looking at some maps there is only slight overlap with the most eastern lions and most western tigers. Not sure if they shared that small overlap at the same time either.