The UK has sanctioned a Russian military officer accused of helping poison former double agent Sergei Skripal with novichok in Salisbury.

The Foreign Office has imposed 56 new sanctions on people and entities linked to Russia, including those in the Wagner mercenary group that operates unofficially on Vladimir Putin’s behalf, and companies based in China, Turkey and central Asia supplying parts to Russia.

Denis Sergeev, who the Met Police charged over the attempted murder of double agent Mr Skripal, has been sanctioned under the chemical weapons sanctions regime.

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“Sergeev provided support in the preparation and use of the chemical weapon novichok in Salisbury…and provided a coordinating role in London on the weekend of the attack,” the Foreign Office said.

Mr Skripal and his daughter Yulia were found unconscious on a bench in Salisbury, Wiltshire, in March 2018.

Police said nerve agent novichok was applied to the front door of his home.

Three Russians, who police said are GRU military intelligence officers, have been charged in absentia over the incident.

Sergeev was the last to be charged after police said he was acting under the alias Sergey Fedotov.

A public inquiry into the death of Dawn Sturgess, a woman unwittingly killed after coming across a sample perfume bottle containing novichok, heard Mr Skripal believed Mr Putin had ordered the attack on him.

Moscow has repeatedly rejected British accusations the Kremlin was involved.

The inquiry heard the amount of novichok in the perfume bottle was enough to kill thousands of people.

Also included in the latest sanctions round are companies supplying Russia with military equipment being used in its war against Ukraine.

Ten companies based in China, and a handful from Turkey, Estonia, Kazakhstan and Uzbekistan, are on the list for supplying and producing machine tools, microelectronics and components for drones used by Russia in Ukraine.

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Russian-based mercenary groups operating in sub-Saharan Africa with links to the Kremlin are also on the list.

The Foreign Office said they have threatened peace and security in Libya, Mali and the Central African Republic, and have committed widespread human rights abuses across Africa.

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Foreign Secretary David Lammy said: “Today’s measures will continue to push back on the Kremlin’s corrosive foreign policy, undermining Russia’s attempts to foster instability across Africa and disrupting the supply of vital equipment for Putin’s war machine.

“And smashing the illicit international networks that Russia has worked so hard to forge.

“Putin is nearly 1,000 days into a war he thought would only take a few. He will fail and I will continue to bear down on the Kremlin and support the Ukrainian people in their fight for freedom.”

Police have made a direct appeal to those involved in the murder of a teenager to finally bring her family closure, exactly 30 years after she disappeared.

Lindsay Rimer, 13, went out to buy a box of Corn Flakes late in the evening on 7 November 1994 and never returned home. Her body was found in a canal close to her home six months later.

Lindsay’s family have also marked this year’s anniversary with a renewed appeal for information from the public, particularly in the town of Hebden Bridge in West Yorkshire where Lindsay lived and died.

“This person should be in prison, not us because that’s where we feel we’ve been for the last 30 years,” her sister Kate Rimer told Sky News.

Juliet Rimer was just one when her sister was killed but has recently been reading letters and diaries to gain a better understanding of a life cut short.

“It’s just, it’s a bit of a horror film that we have to do this,” she said. “The fact that I had a sister that I never knew who was murdered, I just can’t wrap my head around that. It’s had a massive impact on me.”

Kate, who played the part of her sister in a police reconstruction a year after her disappearance, says the family believes someone has information that could lead to her killer’s arrest.

“It’s usually been my mum who does this but the emotional toll it’s taken on my parents means that they just can’t do this anymore.

“It’s incredibly emotional, it opens everything up, and it reflects back over 30 years ago and everything that we lived through then. And just the horror of a loved family member, a child being murdered, is a really bizarre situation. You live your normal life around that and then we’re opening up again to bring murder and death back into our family.”

In the years since Lindsay’s disappearance, police have spoken to more than 5,000 people and examined 1,200 vehicles. Two men were arrested and later released.

A new sighting of Lindsay after she left the convenience shop on the night she disappeared has been confirmed and police believe those in the community have vital information.

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Detective Chief Inspector James Entwistle of West Yorkshire Police made a direct appeal to those who were involved in killing and disposing of her body.

“Has this been on your conscience for thirty years?” he said.

“It’s perfectly possible there’s more than one person involved, its perfectly possible there’s a vehicle involved. Maybe you didn’t murder Lindsay but you know exactly who did because you were there and that’s sat on your conscience for 30 years.

“Now is the time to come and talk to us, now is the time to draw a line under this and bring that closure for Lindsay’s family.”

New posters featuring Lindsay’s picture have gone up around Hebden Bridge as part of the appeal for information and an increased police presence will be in the town.

Juliet said: “It has been 30 years but Lindsey didn’t deserve this and we owe it to her as her family to keep doing this.”

Lucy Letby suggested she could give “tips” to a colleague on how to get away with murder, a public inquiry has heard.

The child serial killer exchanged WhatsApp messages in 2017 with union rep Hayley Griffiths about the US legal drama How To Get Away With Murder.

The discussion took place a year after the neonatal nurse was moved to clerical duties at the Countess of Chester Hospital following concerns she may have been deliberately harming babies.

In a message to Letby, Ms Griffiths wrote: “I’m currently watching a programme called how to get away with murder. I’m learning some good tips.”

Letby replied: “I could have given you some tips x”

Ms Griffiths said: “I need someone to practice on to see if I can get away with it.”

Letby wrote: “I can think of two people you could practice on and will help you cover it up x”

Ms Griffiths replied: “Deal. I will get thinking of a plan. Get the cruise booked as our getaway.”

The pair were working in the hospital’s risk and patient safety department a year before Letby was arrested on suspicion of multiple murders by Cheshire Police.

Ms Griffiths said she was aware of the concerns of foul play and the connection to Letby by September 2016.

Shahram Sharghy, representing some of the families of Letby’s victims, asked: “Given the severity of the allegations that were made, and would you agree they are possibly the most serious allegations that anybody could make against a healthcare professional, were you making light of those allegations when you were referring to potentially committing a crime?”

Ms Griffiths answered: “No.”

Mr Sharghy asked: “Can you even begin to imagine and put yourself in the position of the families of the babies who were harmed when they see those messages?”

Ms Griffiths said: “I know… I am so remorseful. As soon as I saw them myself I was upset and I can’t begin to imagine… I can only apologise and say I have learned. I can’t go back in time but I have reflected absolutely on it.”

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Earlier, Ms Griffiths told counsel to the inquiry Rachel Langdale KC: “It was nothing more than a conversation. However, I truly and deeply regret having started that conservation… this is completely unprofessional, poor judgement on my behalf and completely insensitive. And for that, I can only apologise from the bottom of my heart.”

Letby, 34, from Hereford, is currently serving 15 whole-life orders.

She was convicted at Manchester Crown Court of murdering seven infants and attempting to murder six others between June 2015 and June 2016.

The Thirlwall Inquiry into the events surrounding her crimes is expected to sit until early 2015. The findings are expected by late autumn that year.