I was specifically implying Russia in my comment. Russia uses patient, shady, and asymmetric tactics. Look at recent history. They annex small regions without waging outright war. Random undisciplined artillery commanders shoot down airliners without orders. Oops, we shot down your plane. Oops, we annexed the eastern half of your country. Oops, a bunch of Non-Russians guys with Russian equipment just invaded your country. They are getting clever. The structured processes of the UN and NATO are left paralyzed. Small, cheap, fast moving tanks might be useful against this gang warfare methodology.