China hit back on Monday against Turkish criticism over its treatment of ethnic Uighurs and denied Ankara's claim that a renowned poet from the Muslim minority had died in custody, calling it an "absurd lie".
China's embassy in Ankara posted a lengthy response on its website that said Aksoy's accusations were false and urged the government to retract them.
The Uighurs are a Muslim Turkic-speaking minority based in the north-west Xinjiang region of China, which has come under intense surveillance by Chinese authorities.
An estimated one million Muslim Uyghurs are believed to be detained in these camps in Xinjiang province.
"The Chinese Foreign Ministry's response to the Turkish Ministry of Foreign Affairs: the allegations are outrageous, we have an official initiative", the tweet read.
While Turkey and China broadly have good relations, Aksoy said he was responding to the death of Heyit in a Chinese jail.
Beijing faces growing global pressure as it continues to use the excuse of fighting terrorism and radicalization to persecute Uyghur Muslims. "We are opposed to maintaining double standards on the question of fighting terrorism", said the statement, attributed to an embassy spokesman.
The unverified video, published by China Radio International's Turkish service, comes after Turkey's Foreign Ministry reported Heyit's death in a statement on China's detention of Uighurs and other Muslim minorities.
Beijing has refuted claims of clamping down on the Uighurs, outlining that only people who have committed minor offences when involved in terrorist activities are made to go through vocational training at "vocational education institutions". Reports of his death surfaced Saturday. Heyit was a master of the dutar, a type of two-stringed instrument with a long neck that is found in Iran and throughout Central Asia. At one time, he was venerated across China.
Academic Elise Anderson, who studies Uyghur music, noted on Twitter that "his skin is pale and sickly looking".
Heyit's detention reportedly stemmed from a song he performed titled Fathers.
But three words in the lyrics - "martyrs of war" - apparently led Chinese authorities to conclude that Heyit presented a terrorist threat.
The Uighurs make up about 45% of the population in Xinjiang.
The plight of China's Uighurs is closely followed in Turkey due to shared linguistic, cultural and religious links and the presence of tens of thousands of ethnic Uighurs there.
In its last report released on last September, Human Rights Watch blamed the Chinese government for a "systematic campaign of human rights violations" against Uyghur Muslims in northwestern Xinjiang, an autonomous region in the country.