Ukrainian President Volodymyr Zelenskyy said that Andriy Yermak, his chief of staff, has resigned after anti-corruption searches on his home and office on Friday morning.

Zelenskyy announced the resignation in an address he posted online Friday.

The head of Zelenskyy's presidential office, Yermak is the president’s powerful right-hand man and had been leading the negotiations with the United States to end the war with Russia.

Yermak’s fall strips Zelenskyy of his closest adviser and chief negotiator at a moment when he has been under intense pressure to agree to a new peace plan with Russia.

Yermak had increasingly faced suspicion he could be implicated in a sprawling high-level corruption scandal in Ukraine’s energy sector that has rocked the country’s government, already taking in a former business partner of Zelenskyy’s and prompting the resignations of the justice and energy ministers.

Zelenskyy had resisted calls for Yermak’s resignation, but after the highly publicized raids on Yermak’s addresses Friday morning, he appeared to have concluded the suspicions against his chief of staff were causing too much damage. He did not directly acknowledge the raids or accusations during his address, saying he had made the decision to remove Yermak because he wanted to "avoid rumors and speculation" that could harm internal unity at a critical time.

"“For internal strength to exist, there must be no reasons to be distracted by anything other than defending Ukraine. I want there to be no questions whatsoever about Ukraine," Zelenskky said in the video statement.

He said he would hold consultations on Saturday to choose Yermak’s replacement.

Investigators from Ukraine’s National Anti-Corruption Bureau (NABU) and Special Anti-Corruption Prosecutor’s Office (SAPO) on Friday morning raided Yermak’s office and home as part of their investigation into the corruption scandal that has been dubbed “Mindich-gate” in Ukraine, a reference to Zelenskyy’s former business partner Timur Mindich who is implicated.

Prosecutors allege senior officials and Mindich arranged a kickback scheme that funneled tens of millions of dollars from contractors building defenses to protect Ukraine’s energy infrastructure. Investigators have not formally announced any allegations against Yermak or charged him. But he has faced mounting suspicion with critics alleging Yermak must have known about the corruption or bore responsibility for it. Some members of Parliament and anti-corruption campaigners also alleged that he was featured in recording made as part of the investigation under the name "Ali Baba."

Yermak was also accused by opponents of being behind a failed attempt over the summer by Zelenskyy’s administration to strip independence from the same anti-corruption bodies now investigating him, which triggered mass protests.

There is no evidence Zelenskyy himself knew about the alleged corruption scheme or benefited from it. But as the scandal moved to the heart of his administration, he faced widespread calls to act or be seen as complicit, with worries he could face protests again if Yermak remained in post.

On Friday before his resignation Yermak posted he was "fully assisting" investigators.

Often referred to as Zelenskyy’s "grey cardinal," Yermak has long-faced accusations of creeping authoritarianism and over-centralizing power, while allegations of corruption have lingered.

He has played a central role in Ukraine’s negotiations, including leading the delegation to Geneva last weekend for the talks with the U.S. on the Trump administration’s new peace plan. In an interview on Thursday with Time Magazine, Yermak ruled out ceding any territory to Russia.

Zelenskyy on Friday thanked Yermak for his role in leading the negotiations to end the war, saying "it has always been a patriotic position" and that he had represented Ukraine's position "exactly as it should be."

New peace talks are expected to be held perhaps as early as this weekend and Zelenskyy said they would now be headed by the head of Ukraine’s General Staff, as well as its National Security Council and foreign ministry representatives.

Kremlin spokesman Dmitry Peskov said the "events unfolding in Kyiv," referring to Yermak's resignation, "point to a profound political crisis provoked by corruption scandals," in comments Friday, according to Interfax, Russian state media.

ABC News' Anna Sergeeva contributed to this report.