The Ukrainian authorities want to solve the issue of former prime minister Yulia Tymoshenko, but she refuses to cooperate with them, Foreign Minister of Ukraine Leonid Kozhara has said.

"Ms. Tymoshenko refuses to cooperate with the Ukrainian authorities. The matter can be resolved subject to Tymoshenko's good will and based on Ukraine's laws," Kozhara said in an interview with Channel 5.

He added that from the very start of the trial the former prime minister chose political rather than legal remedies, and now she regularly refuses medical examination and blood tests. "From a legal point of view, Ms Tymoshenko is actually not sick, because there is no evidence," Kozhara said.

The foreign minister confirmed that this matter does hinder Ukraine's relations with the EU and the Ukrainian authorities are trying to find a solution to this problem. "We want to solve it, but based on the Ukrainian laws," Kozhara said.

Kyiv's Pechersky District Court found Tymoshenko guilty of abuse of office in signing this gas supply contract and sentenced her to seven years in prison on October 11, 2011.

Tymoshenko has been serving her sentence at a penitentiary in Kharkiv since December 2011.

Since May 9, 2012, she has been staying at a Kharkiv hospital and receiving medical treatment there. Doctors from the Berlin-based Charite clinic are determining the tactic of her treatment and medicines to be used.