Not new. USA wants to quell the use of nuclear weapons, but we are the only nation to have used such against a civilian population or even at all. USA despises the use of chemical warfare, but we have no problem using it ourselves.
https://en.wikipedia.org/wiki/Agent_Orange
During the Vietnam War, between 1962 and 1971, the United States military sprayed nearly 20,000,000 US gallons (76,000,000 l) of material containing chemical herbicides and defoliants mixed with
jet fuel in Vietnam, eastern Laos and parts of Cambodia, as part of
Operation Ranch Hand.
[4][5] The program's goal was to defoliate forested and rural land, depriving guerrillas of cover; another goal was to induce
forced draft urbanization, destroying the ability of peasants to support themselves in the countryside, and forcing them to flee to the U.S. dominated cities, thus depriving the guerrillas of their rural support and food supply.
[5][6]