U.S. Secretary of State John Kerry said Thursday the "critical security alliance" with South Korea is key to peace and stability in Northeast Asia, as he issued a congratulatory message ahead of South Korea's Liberation Day.

"Our bilateral partnership continues to thrive based on our shared values of freedom, democracy, human rights, and the rule of law. Our enduring relationship brings opportunities and prosperity to our two countries, and our critical security alliance brings peace and stability in Northeast Asia," Kerry said in the message.

The message was issued ahead of the 71st anniversary on Aug. 15 of Korea's independence from Japan's 1910-45 colonial rule.

"As our friendship strengthens, we have opened many new frontiers of cooperation, such as cyber, space, climate change, and global health. These efforts demonstrate how together we can make the world safer and healthier," Kerry said.

"On this special day, the United States joins the Republic of Korea in celebrating your success, culture, and history. I wish all Koreans a wonderful and joyful holiday celebration," he said. (Yonhap)