It's another salvo in the smartphone war.
Samsung has filed an injunction to block the sale of Apple's sale of Apple's iPhone 4S in Japan and Australia, citing patent infringements.
Since April, Apple and Samsung have been waging a legal battle against each other in nine countries.
Apple claims Samsung's Galaxy tablets and smartphones are copies of its iPads and iPhones. Samsung claims that Apple has infringed on its mobile patents.
But despite the global legal tussle, both companies have worked together. Samsung makes parts for the iPhone and the iPad.
And, revealing the depth of the relationship, South Korea's Chosun Ilbo reports that the president of Samsung Electronics was invited to the private memorial service for Apple co-founder Steve Jobs.
Lee Jae-Yong told South Korean media:
"Steve Jobs was a bit hot-tempered and picky, so he would often complain on the phone for an hour or so whenever he had a dispute. We were competitors, but we also grew fond of each other to the point where he would be the first to call and console me whenever I was encountering difficulties,"
So yes, the relationship between Apple and Samsung is... complicated.