Super Junior’s Choi Siwon has been caught up in a controversy between Korea and Japan after expressing his stance on Dokdo islets through his Twitter.

Siwon recently retweeted a tweet by Korea’s Blue House made on August 10, which read, “Dokdo is undoubtedly South Korea's land, where we should sacrifice our lives to. With pride, let’s protect our land.”

Having over 2.5 million people following him on Twitter, Siwon’s post immediately spread to Japan and China, and received criticisms from several Japanese fans, saying that they had been let down by Siwon’s stance.

Concerns over Siwon and Super Junior’s future activities in Japan are increasing after the star expressed his stance in a quite sensitive issue.

Meanwhile, tension has been building up between South Korea and Japan since President Lee Myung Bak made his trip to the easternmost islets, which the Japanese government has been claiming its sovereignty over for decades.