Parliament in December dismissed Tarasyuk, a presidential appointee, and Prime Minister Viktor Yanukovych asked that he be blocked from acting as foreign minister.
Tarasyuk says his dismissal was illegal and President Viktor Yushchenko has kept him in his post.
Meanwhile, Yushchenko today vetoed for a second time a bill that would reduce his powers.
Yushchenko says the bill, which outlined the powers of the cabinet, violates the constitution. He also says it goes against all agreements between his team, parliament, and the government.
Last week parliament overrode his initial veto of the measure.
Under the constitution, Yushchenko was obliged to sign the law after parliament overturned his veto.
But he says deputies have slightly changed the wording of the bill from the text approved last year, which gave the president the right to send it back to parliament again.
(compiled from agency reports)