Agreed, how easy would it be to build / prepare some sort of defense capbilities / infrastructre near borders with Russia. Make sure there are trenches, near the border with Russia, so if they DO try and invade, the people can ensure they are faced with a deadly if not brutal response.
A trench could be dug, on the pretext it will be used to bury cables, these can then be buried in such a way they can be exposed quickly, defences put up, and can be filled with troops at very short notice.