BERLIN, APR 26 (AP/UNB) - A German newspaper reports that President Joachim Gauck is canceling a planned trip to Ukraine to protest the imprisonment of the country's former prime minister, Yulia Tymoshenko.

The Daily Sueddeutsche Zeitung reported Thursday that the president won't attend a mid-May meeting of central and eastern European heads of state in the Ukrainian Black Sea resort of Yalta.
Repeated calls to the president's office remained unanswered Thursday.

Germany has been particularly critical of Ukraine over the Tymoshenko case, whose condemnation to a seven-year prison term is widely viewed in the West as politically motivated.

Tymoshenko, who went on a hunger strike Friday, suffers severe back pain. Germany and the government in Berlin is offering to treat her in Germany.