Germany has been leading the European Union's critical stance on Ukraine over the Tymoshenko case. The government is also offering to treat her in Germany, but Kiev has rejected the offer. Recently, however, the Ukrainian leadership proposed that German doctors could come to Ukraine and treat her at Kharkiv.
But Einhaeupl and his colleague, Norbert Haas, said it would probably take months for a team of physicians and specialists to treat her condition appropriately.
"A short visit would not yield any substantial results," Haas said.
Einhaeupl stressed the doctors are concerned by Tymoshenko's hunger strike, saying she had deteriorated significantly since their first visit in January. He said he hoped to be able to examine her again within the next week; the visit would have to be approved by Ukrainian authorities.
In their evaluation of the Kharkiv hospital, the doctors say Ukrainian authorities have made great efforts to provide the best possible conditions for her treatment there.
"But Ms. Tymoshenko's particular problems of physical and psychological nature, as well as the particular evolution of her illness let it appear unlikely that the therapy there will be successful," the report stated.
Tymoshenko denies the abuse of power charges, saying they are part of a campaign by President Viktor Yanukovych, her longtime foe, to bar her from politics. Yanukovych, who narrowly defeated her in the 2010 presidential race, has denied involvement in the Tymoshenko case.
Ukraine is increasingly under pressure over its treatment of Tymoshenko. EU officials have threatened her case and those of other jailed opposition members could derail a planned rapprochement between Kiev and the 27-nation bloc.
German President Joachim Gauck canceled a visit to Ukraine next month on Thursday, and calls were growing from opposition lawmakers for EU government officials to boycott the Euro 2012 football championship that Ukraine will co-host in June.
Government spokesman Steffen Seibert said Friday Chancellor Angela Merkel's top adviser on foreign policy issues discussed Tymoshenko's case again with Ukraine's Deputy Foreign Minister Thursday. Seibert said the chancellor keeps herself "very informed about the Tymoshenko case."
Baetz reported from Berlin. Karel Janicek contributed from Prague. Follow Juergen Baetz on Twitter at http://www.twitter.com/jbaetz