I think that depends ...
I consider any nation which owes its very existance directly to imperialism as imperialistic ...
Without direct imperialism, Israel would not exist. The same is true with the USA ... certainly one could say that without imperialism that Russia would be no where near as large as it is ... thus I also consider Russia to be imperialist.
The same goes for many other nations ...
I totally agree.
I think of Imperialist country as every country with an ambition to control other than its own terrotory and/or other than its own population by any means in order to gain either money, resources, etc. Through this perspective, majority of all nations are Imperialist... The ones that actually took particular 'action' in that direction are also many: Britain, USA, France, Denmark, Japan, China....in other words: the entire 'West' and (as Chomsky puts it) 'honorary west' like Japan and China (I'm the one calling China the honorary wester power, after all they've f***** their 'communism' raw and are basically a capitalist society with totalitarian flavour)... The countries that haven't been able to take 'the action', but I'm sure ALL of them were profusely salivating after it, are just sucker-ups... they suck up or HAVE to suck up to Imperialist nations like the USA and Britain to either 'get some' or to basically (simplistically put, even though sometimes it's more reality-based than not) survive.
For example, Czech Republic is by far not an Imperialist country, however, if it could, it would be and so it either chose or was in some way (usualy economical) pushed to have to suck up to the US and the European Union.
When it comes to Israel - hell yea, they're Imperialists flesh and bones.
What I'm saying doesn't, of course, mostly apply to populations of these nations because many are ignorant of their governments' ambitions, especially when it comes to international affairs and such.
Make my funk the p-funk, I wants to get funked-up...