This is not true, NATO is a defensive pact. Only russian propaganda says differently

I think that NATO was founded after World War II, largely due to British efforts to contain the Soviet Union and its influence in Europe ?

true, but nothing there say that russia cat't apply to join

Except the "no/minor corruption" requeriment...

They can apply. They'd be refused on that and many more grounds.

Then there should be no country in NATO.

This is western propaganda. NATO were used to attack Yugoslavia and Libia. Attacking 2 countries that did not attack you looks offensive, not defensive, to me.