I sont think we have to worry.
Putin will align with China, N. Korea and Iran and start WWlll and this continent will see an armed invasion
You learn that in the police academy? There are one-and-a half countries who have a military with "expeditionary" capabilities. The US and the UK.
Terror attacks? Definetely
Dirty bombs? Sure
Invasion? I think not. It did make for a great movie in the original Red Dawn.