Three former Interior Ministry officers are standing trial in Kyiv in connection with the 2000 assassination of opposition journalist Heorhiy Gongadze.
Yushchenko's chief of staff, Oleh Rybachuk, said he came to the courthouse today to convey the president's "indignation" at the court's decision last month to bar journalists from much of the proceedings.
Also today, the judges postponed proceedings after a defendant complained of a health problem.
Gongadze's decapitated body was discovered in a forest near Kyiv in September 2000. Many in Ukraine suspect then President Leonid Kuchma of ordering the killing.
Kuchma denies the charge.
(Interfax, AP)