Joe Biden's top adviser on Russia and Central Asia at the National Security Council steps down. " But at the same time, they add that Eric Greene is preparing to retire from the diplomatic service after more than three decades of service..

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At the White House, Greene coordinated policy management for the National Security Council, its European team, and government agencies.. He helped prepare Biden for his 2021 Geneva summit with Putin and was central to crafting the administration's response to Russia's invasion of Ukraine..

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“Eric has played a key role in our efforts here at the Security Council, leading the way in holding Russia to account and supporting Ukraine.. His ideas and actions have proved important on numerous occasions, and I am eternally grateful for his service,"

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On Tuesday evening, during his address to the citizens of the country, Biden said that Russia's invasion of Ukraine was a " for the US and its NATO allies. He again promised support to the President of Ukraine Volodymyr Zelensky - as long as it takes.