Russia's economic strength will last another 18 months before unraveling as Putin grapples with policy 'trilemma,' think tank says

• Russia's economy could begin to see major challenges in the next year-and-a-half, think tank researchers write. 
• Putin is facing a policy "trilemma" as the nation wades through the third year of war in Ukraine. 
• "Russia's economy is now stable both in spite of and as a result of Western sanctions."

Russia's economic strength could last another year-and-a-half before it starts to fade, according to the Carnegie Endowment for International Peace.