In February 2014, the Russian army stood "not ahead, but behind" Crimean women and children, effectively taking them hostages to prevent Ukrainian army to stand for defending Crimea.
Russia's Putin has personally confessed this in his interview. Direct speech, YouTube video, English subbed.
The English translation happily sits at
kremlin.ru, the official media outlet of Moscow's regime (highlight mine)
[…] And let’s see those troops try to shoot their own people, with us behind them – not in the front, but behind. Let them just try to shoot at women and children! I would like to see those who would give that order in Ukraine.
The operation has reached its objective. Ukrainian army did not stand up for defending Crimea, and Russia is currently (late 2020) controlling the entire peninsula:
Putin has kept his promise, and has used Ukrainian civilians as human shields throughout Russia’s invasion, partial occupation, and ongoing warfare against Ukraine. — Radio Lemberg
Stack Exchange Users' Various Definitions of Terrorism
Addressing a statement expressed in a comment claiming that the definition of "terrorism" versus "war crimes" might be different depending on who commits the act in question, be it a state or an individual.
Immediately after the September 11 attacks, the members of the United Nations General Assembly working group nearly reached consensus on the following definition of terrorism:
[Terrorism is an act] intended to cause death or serious bodily injury to any person; or serious damage to a State or government facility, a public transportation system, communication system or infrastructure facility ... when the purpose of such act, by its nature or context, is to intimidate a population, or to compel a Government or an international organization to do or abstain from doing an act. (¹)
Most definitely, the definition is very clear about the case. We, the Stack Exchange users, may have our own definitions of Terrorism, but our definitions do not play at the international level.
Additionally, the accusation of Terrorism was the very background for the U.S. armed response against the states of Afghanistan and Iraq.
¹) Reference: Measures to Eliminate International Terrorism: Report of the Working Group, U.N. GAOR 6th Comm., 55th Sess., Agenda Item 164, at 39, U.N. Doc. A/C.6/55/L.2 (2000), quoted in Surya P. Subedi, The U.N. Response to International Terrorism in the Aftermath of the Terrorist Attacks in America and the Problem of the Definition of Terrorism in International Law, 4 INT'L LAW F. DU DROIT INT'L 159, 162 (2002), quoted by Michael P. Scharf's Defining Terrorism as the Peacetime Equivalent of War Crimes: Problems and Prospects.