Just a day after Russia was hit with sanctions for a cyberattack during the U.S. presidential elections, Russian Prime Minister Dmitry Medvedev tweeted "RIP" to the outgoing Obama administration.

It is regrettable that the Obama administration, which started out by restoring our ties, is ending its term in an anti-Russia agony. RIP

— Dmitry Medvedev (@MedvedevRussiaE) December 30, 2016

Politico notes Medvedev was once considered pro-West. His Twitter blast came after the U.S. announced it would sanction Russia and expel 35 of its intelligence operatives over election campaign hacks allegedly backed by the Kremlin.

Russia has vowed to retaliate for the sanctions.

• Russia Foreign Minister Lavrov: We'll Retaliate, Expel 35 US Diplomats
• Trump to Meet With Intelligence Officials on Russian Hacking