Russia could launch chemical attack in Ukraine - White House
Image source, SOPA Images/Getty ImagesRussia could be planning a chemical or biological weapon attack in Ukraine - and "we should all be on the lookout", the White House has said.
Press secretary Jen Psaki said Russia's claims about US biological weapon labs, and chemical weapon development in Ukraine, were preposterous.
She called the false claims an "obvious ploy" to try to justify further premeditated, unprovoked attacks.
It comes after Western officials shared similar concerns about fresh attacks.
They said they were "very concerned" about the risk the war could escalate, and particularly the possibility of Russia using non-conventional weapons.
This most likely refers to chemical weapons although the term also covers tactical (small-scale) nuclear weapons, biological weapons and dirty bombs.
"We've got good reason to be concerned," said one Western official.
They said this was partly because of what had been seen in other places where Russia has been engaged - notably Syria where chemical weapons were used by its allies.
Ms Psaki said: "We should all be on the lookout for Russia to possibly use chemical or biological weapons in Ukraine, or to create a false flag operation using them - it's a clear pattern."
Earlier on Wednesday, the UK Ministry of Defence said in a tweet that Russia had used thermobaric rockets in Ukraine. These rockets are also known as vacuum bombs because they suck in oxygen from the surrounding air to generate a high-temperature explosion.
This makes them more devastating than conventional explosives of a similar size, and can have a terrible impact on people caught in their blast radius.
The fears around chemical weapon use were borne from Russian claims potentially "setting the scene" for some kind of "false flag" claim, Western officials said.
In a tweet, the Russian Embassy referred to claims that "recently found documents" showed components of biological weapons were made in Ukrainian laboratories - with funding from the US Department of Defense.
The US dismissed the claims, saying it was the "kind of disinformation operation we've seen repeatedly from the Russians over the years in Ukraine and in other countries".
Russian officials and media have also claimed in recent days that Ukraine was planning to build a so-called dirty bomb - which disperses radioactive material.
Meanwhile Russia's foreign minister has claimed Ukraine had been seeking nuclear weapons.
Some believe Moscow is pushing these claims to come up with a justification for its own public about why it invaded Ukraine. But Western officials also fear they could be used as the basis for a "false flag" event.
For example, Russia could claim any dispersal of non-conventional weapons came from Ukrainian facilities or troops, or they were used first by Ukraine. That could justify, for Moscow, the subsequent use of non-conventional weapons by Russia.
The Western official said similar stories had come from Russia before their use in Syria.
There were "other indications as well", they said - likely referring to some kind of intelligence. "It's a serious concern for us."
Russia's ally, the Assad government, used chemical weapons in Syria on multiple occasions against civilians.
Russia is also accused of using nerve agents - a type of chemical weapon - in attempted assassinations like that of Sergei Skripal in Salisbury in 2018 and against opposition figure Alexei Navalny in Russia in 2020.
The global watchdog that oversees the Chemical Weapons Convention - the OPCW - describes a chemical weapon as a chemical used to cause intentional death or harm through its toxic properties.
Their use is banned under international humanitarian law regardless of a valid military target because their effects are indiscriminate by nature and designed to cause superfluous injury and unnecessary suffering.
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