The list, based on <deaths per million> among not too small counties is the following one, up to 14.4.2020. This doesn’t use any lags, only the latest values. Aligning countries accounting for the phase of the spread in the main graph
Spain
Belgium (Belgium will soon be first)
Italy
France
UK
Netherlands
Switzerland
Luxembourg (in the list, despite it is under 1 million)
Sweden
Ireland
US (in specific areas, like NY, much worse ratio; here is US average)
Iran
Portugal (soon to go ahead of Iran)
Denmark
Germany
Slovenia
Norway
Denmark
Skopje
Romania
Czech Republic
Also presented here graphs of total number of deaths, so no ratios per popuulation, for comparison.