In the same session, legislators were also said to have passed a decision in favour of holding a referendum on joining the Russian federation, to be held “no later than 11 May”.
According to Itar Tass, the document sealing its independence will see Donetsk “build its relations in line with international law and on the basis of equality and mutual benefits”.
The local government building was taken over on Sunday night by pro-Russian activists, and on Monday the Russian news agency Itar Tass reported that “members of the regional legislature” had moved to declare the city and its surrounds the Donetsk People’s Republic.
The eastern Ukrainian city of Donetsk has reportedly declared itself independent from the central government in Kiev and set a date for a referendum on joining Russia, according to local media reports.
The Shakhtar Donetsk, 26, forward has been a target for the Blues this season, and has called Chelsea a "great club".
Earlier this month Shakhtar manager Mircea Lucescu said that the player would be allowed to leave should the club receive the right bid.
"It's great to have a club like Chelsea interested in me," Teixeira said.
"I always try to do my job well and play to my best.