From this article, we look for evidence to prove of Russia’s involvement in Ukraine. If we can prove that the two servicemen are former soldiers under the forces of the Russian Military force and had taken orders from Russia, we can prove Russia is involvement with the war in Ukraine. There are two kinds of acts, physical and verbal acts. A both physical and verbal act of State constitutes practice that contributes to the birth of customary international law. Physical acts include, battlefield behavior, the use of certain weapons and treatment provided to different categories of persons. Verbal acts include military manuals, national legislation, national case-law, instructions to armed and security forces, military communiqués during war, diplomatic protests, opinions of official legal advisers, comments by government on draft treaties, executive decisions and regulations, pleadings before international tribunals, statement in international organizations and at international conferences and government positions taken with respect to resolutions on international organizations.