Throughout the scandal over the Russian ex-spy's poisoning, the British government, Prime Minister May and Foreign Secretary Johnson confidently claimed that the military-grade nerve agent used in the attack was Russian-made, convincing much of the public and London's allies that this was indeed the case.
Now that Porton Down experts have established that they can't actually pinpoint the poison's origins, the Russian Embassy in London made certain to remind London how absurd it was that the experts London used to try to blame Moscow were actually saying something very different.
"Why would @foreignoffice delete this tweet from 22 March?" the Embassy sarcastically tweeted on Wednesday, accompanying the tweet with a screenshot of a deleted Foreign Office tweet with the "produced in Russia" claim.
The Foreign Office admitted to Sputnik that they deleted the errant tweet, claiming it "did not accurately report" the March 22 remarks of UK Ambassador Laurie Bristow, which it was said to be quoting. The Defense Science & Technology Lab issued its own response, saying that it had "never" been their "responsibility to confirm the source of the agent."
The scandal over the deleted Foreign Office tweet prompted questions from Shadow Home Secretary Diane Abbott, who released a statement saying that Foreign Secretary Johnson seems to have "misled the public" with his claim that Porton Down supported his claim that the nerve agent used in Salisbury was Russian.
"Those officials have made it clear that they cannot identify its source, and are not able to definitively say it came from Russia," Abbott emphasized. "Boris Johnson is supposed to represent Britain on the world stage, but time and again he has shown he is unable to do so responsibly," she added.
Johnson had earlier told German media that the "people from Porton Down" had told him there was "no doubt" about Russia's responsibility for the attack.
Abbott also told BBC Radio 4 that the Porton Down officials' remarks vindicated Labour leader Jeremy Corbyn, who has faced political pressure from Conservatives and even members of his own party for asking Prime Minister May for more evidence of Russian involvement in the Skripal attack.
The Foreign Office's gaffe prompted Twitter users to provide their own explanations about why the tweet was deleted. Some argued that it was an "(incompetent) attempt" to cover up the government's "lies." Others stressed that "anything is possible" with Boris Johnson as foreign secretary.
Others joked that next Russia will be blamed for hacking the Foreign Office and deleting the tweet, or pointed out just how significant the potential fallout from the Skripal scandal really is.
Russian ex-spy Sergei Skripal and his daughter Yulia were hospitalized in Salisbury, southern England on March 4 in a chemical attack believed to involve the A-234 nerve agent. Sergei remains in critical condition; his daughter has regained consciousness and is making a recovery. London accused Moscow for the attack, and initated a series of measures directed against Russia, including the expulsion of 23 Russian diplomats from the UK. Moscow has rejected the British government's accusations, saying claims of Russian involvement are entirely unsubstantiated.