Russia’s economy is under growing strain as its invasion of Ukraine drags on and Western sanctions are undermining President Vladimir Putin’s ability to sustain his war, a leading European economist said after briefing finance ministers on Tuesday.

The announcement was made by leaders of Britain, France, Germany, Poland and Ukraine after a meeting in Kyiv, and a phone call with President Trump.

European Union foreign policy chief Kaja Kallas said on Tuesday she does not think Russia is truly interested in establishing peace in Ukraine.