The paper discloses theoretical approach of multi-domain military operations (later – MDO) and how it might be used by small NATO countries. Hereby NATO MDO is being understood as multinational approach, operational goal focused, joint armed force operations. Additional to this future warfare insights are being provided revealing difficulties of small NATO countries facing MDO or even higher level of military operations. In order to meet the goal of the article content analysis was executed disclosing various perspective on MDO and its’ application using official, public available information sources. The results of the paper determine difficulties for small NATO countries to execute MDO or even higher profile operations and for this case its’ leads to necessity to integrate national armed forces into bigger ones like NATO alliance. Final outcome of the paper disclose that modern warfare requires more than just MDO but rather joint all domain operations (later – JADO). Hereby JADO is new venue to face future conflict which goes beyond military domain and for this purpose small countries have to adopt accordingly.