Border police seize a "suspect" during an anti-terror drill at the Gobi Desert in Kashgar, the Xinjiang Uygur autonomous region, in May, 2015. [Photo/Xinhua]

China and the US agreed on the two trust-building mechanisms in November by signing a memorandum of understanding. They were proposed by President Xi Jinping during a meeting with his US counterpart Barack Obama in 2013.

Wu, a 42-year-old military diplomat who once served as deputy defense attache at the Chinese embassy in the US, said the Chinese and US defense ministries have communicated and cooperated closely on establishing the mechanisms over the past two years.

Wang Fan, vice-president of China Foreign Affairs University, said that in the past two years the two countries "have deepened their understanding of the real strategic intentions of each other". Wu added that signing the annexes will help increase strategic mutual trust between the two nations.