In view of the fact that many countries still have a poor military capability, or no military capability at all how much longer can you pretend that your country won't be invaded, or cannot be invaded?
Surely, they are empty words and empty threats, which have no substance at all because they are not supported by any real military capability?
For how much longer can you pretend that your country cannot be invaded?
Most countries in Europe are part of the NATO alliance, so if one country is invaded, all will (theoretically) declare war on the invading nation. If need be, the combined populations, resources, and industrial bases of the NATO countries could field a rather large and formidable military force, if they ever had to do that.
The typical Cold War hypothetical called for the US to use a nuclear deterrent, in the event that the Soviets poured into Western Europe in overwhelming numbers. Fortunately, that never happened, and it's extremely unlikely that such a thing would ever happen.
It's not the same world as it was before or during WW2 when countries could pretend they cannot be invaded. After the advent of nuclear weapons and the Cold War practice of nuclear brinkmanship, people started to have other concerns. Being invaded was the least of anyone's concerns in a world where war could mean total annihilation in less than an hour. Some even believed that being invaded was preferable to having one's country turned into a radioactive wasteland ("better red than dead").