KYIV, Ukraine (AP) — President Volodymyr Zelenskyy on Friday appointed the head of Ukraine’s military intelligence as his new chief of staff, a move that comes as the U.S. leads a diplomatic push to end Russia’s nearly 4-year-old invasion.

Announcing the appointment of Gen. Kyrylo Budanov, Zelenskyy said Ukraine needs to focus on security issues, developing its defense and security forces, and peace talks — areas that are overseen by the office of the president.

Zelenskyy had dismissed his previous chief of staff, Andrii Yermak, after anti-corruption officials began investigating alleged graft in the energy sector.

The president framed Budanov’s appointment as part of a broader effort to sharpen the focus on security, defense development and diplomacy.

“Kyrylo has specialized experience in these areas and sufficient strength to achieve results,” Zelenskyy said.