Is the Ukraine war boosting or damaging the Russian economy?

IMF suggests invasion spending is pushing up GDP but academics argue non-military economy is foundering

This week the International Monetary Fund will assess how well Russia's economy has held up during the Ukraine war and is expected to estimate it had a mild downturn last year, faces a small contraction this year and will enjoy a healthy level of growth in 2024.

This seems to contradict the warning from shortly after the invasion that the country faced a contraction of up to 15% and last month's prediction from the oligarch Oleg Deripaska that international sanctions would drain the Kremlin's finances by next year.