https://focus.ua/opinions/405937/
https://carnegie.ru/commentary/77182
https://ukrainian.voanews.com/a/aslund-kreml-ahresija/4560156.html
https://www.inopressa.ru/article/05Sep2018/handelsblatt/raketen.html
https://www.inopressa.ru/article/04Sep2018/handelsblatt/nordstream2.html
https://lb.ua/world/2018/09/04/406631_kantsler_nimechchini_angela_merkel.html
https://www.kommersant.ru/doc/3731651
By intervening in Syria, annexing Crimea, and sustaining military presence in Eastern Ukraine, Russian President Vladimir Putin seems to have overextended himself. With an annual growth rate of just 1.5%, Russia is now expending 5.3% of its GDP on its military budget, while losing another 3-4% to legal, civilian, and other costs.
https://www.project-syndicate.org/commentary/cost-of-wars-for-russia-by-anders-aslund-2018-09