Either or both.
I don't know how the government should go about it, but they have to convince the public that Russia is a major security threat to the European way of life: assassinations, digital interference, propaganda and actual military invasion.
To give us security against that, its worth an extra % in tax.
Of course that's easy for me to say when I'm financially comfortable, but it doesn't change the reality that our government, plus the governments of all the major European powers, need to ramp up defence spending.