So far Samsung only fights with Apple with whole slew of superior products. Well... also Samsung marketing makes fun of Apple marketing if that counts as a fight.
Apple is certainly no angel but if you think Samsung is a company with no ethical concerns or that it isn't a ruthless competitor you haven't been looking very closely. [No very large company is completely free of ethical issues. I'm not aware of Samsung being over the line to the extent that I wouldn't work for them on that basis.]
So far I've found: http://www.androidcentral.com/samsung-seeking-block-sales-up... Article claims it was just mirroring of Apple court strategy.
I don't know if that's the same thing here: http://www.firstpost.com/tech/south-korea-court-bans-both-ap... But if so then it didn't turn out particularly good for either of the companies.
There was also a bit of government protectionism in South Korea http://online.wsj.com/article/SB125367616595333125.html?mod=... but I think you can't attribute this to Samsung offensive action.