But then again, having a much smaller area and population means it's much easier to control the source of the spread (including the all-important patient(s) zero). Plus, all these big countries do have regions that are extremely densely populated (like the whole BosWash area).
Countries that fought the virus best in Europe are places like Slovakia, Slovenia, Croatia, Lithuania, Latvia and Estonia. They all have small population + small area + small international travel (especially during February/March).
Similar places in Western Europe (Ireland, Portugal, Luxembourg, Switzerland and Belgium) have a much larger circulation of international travellers, so they didn't do so well...