The Ukrainian Parliament finally voted to oust Ukraine’s odious prosecutor general, Viktor Shokin, on Tuesday. The United States and European countries that have provided aid to Ukraine had long pressed for his dismissal; in his year in office, Mr. Shokin became a symbol of Ukraine’s deeply ingrained culture of corruption, failing to prosecute a single member of the deposed Yanukovych regime or of the current government while blocking the efforts of reform-minded deputies. Alas, nothing is likely to change unless President Petro Poroshenko and Parliament agree to install some real corruption fighters and approve serious judicial reform.

Corruption has been pervasive in Ukraine since independence, fed by close-knit ties between politicians and oligarchs and a weak justice system. The protests in 2014 that led to the removal of President Viktor Yanukovych were largely fueled by popular fury at his monumental corruption and abuse of power. Yet his overthrow has yet to show results.

In a speech in Odessa last September, the United States ambassador, Geoffrey Pyatt, said corruption was as dangerous for Ukraine as was the Russian support for a military insurgency in eastern Ukraine. And on a visit last December, Vice President Joseph Biden Jr. said corruption was eating Ukraine “like a cancer.” Among the examples Mr. Pyatt cited was the seizure in Britain of $23 million in illicit assets from the former Ukrainian ecology minister, Mykola Zlochevsky; Mr. Shokin’s office, however, declared that there was no case against the minister, and the money was released.