In a blistering social media post, former Russian President Dmitry Medvedev, now a top Kremlin security adviser, lashed out at Poland for its support of Ukraine, reviving and escalating decades-long tensions between Moscow and Warsaw.

Poland’s surprisingly spirited defense of Ukraine would prove “expensive and pointless,” Medvedev predicted, ominously adding that he was confident that Warsaw would “make the right choice” and embrace Russia again.

Medvedev is a close ally of Russian President Vladimir Putin and served a four-year placeholder presidency when Putin was facing term limits. Medvedev went on to serve as Putin’s prime minister and is now deputy chairman of the Kremlin’s security council. Putin is the chairman.

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In Monday’s post on the Telegram social network, Medvedev lamented that “the interests of Polish citizens have been sacrificed to Russophobia” by “talentless politicians and their puppeteers” in the United States. He branded Polish leaders — two of whom, Jaroslaw Kaczynski and Mateusz Morawiecki, traveled to besieged Kyiv last week with other Eastern European leaders to meet with Ukrainian President Volodymyr Zelensky — “political imbeciles” who were spreading “vulgar” propaganda about Russia.

Read more: yahoo