Volodymyr Zelensky, the Ukrainian president whose phone call with President Donald Trump led to Mr. Trump’s first impeachment, has yet to receive a call from President Biden. But the delay has nothing to do with Mr. Trump’s corrupt attempt to force Mr. Zelensky to dig up dirt on Mr. Biden. Instead, the new U.S. administration is seeking to induce Mr. Zelensky to tackle his own country’s endemic corruption — something that is vital to stabilizing its economy and preserving its fragile independence from Russia.

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