Newspaper headlines: Calls for PM to return Russian money
The fallout from last weekend's attack on Russian ex-spy Sergei Skripal and his daughter continues to dominate Sunday's papers.
On its front page, the Times suggests Theresa May is under increasing pressure to return money given to the Conservative Party by donors with links to Russia.
The paper says that oligarchs from the country, and their associates, have registered donations of more than £820,000 since Mrs May became prime minister.
It claims that the attack in Salisbury on the former MI6 agent, has led to calls for the party to return the money.
A Conservative spokeswoman is quoted saying all donations are properly declared to the electoral commission, and steps have been taken to ensure that "the profits of corruption cannot flow from Russia into the UK".
Meanwhile the Sunday Telegraph's front page says: "Corrupt Russians face UK visa ban". It reports government plans to introduce sanctions against officials from Russia, who are involved in corruption and human rights abuse.
The paper says the move was being planned before Mr Skripal and his daughter were poisoned with a nerve agent.
In the Star, there is a claim that Russian President Vladimir Putin is worried about possible attempts by British spies to poison him.
The paper says he has what it describes as an "army of servants" to taste his food and even employs someone to test his swimming pool water for deadly toxins.
In the Sunday Mirror, there are details about what it describes as the "worst ever" child abuse scandal in Britain.
The paper has conducted an 18-month investigation, which it says suggests that the scale of abuse in the town of Telford, in Shropshire, was much worse than previously thought.
Seven men were jailed in 2012 for sex offences involving dozens of girls, committed between 2007 and 2009. The Mirror says its research suggests that as many as 1,000 children may have suffered abuse in the area since the 1980s.
Assistant Chief Constable of West Mercia Police, Martin Evans, is quoted saying the force is aware of the allegations, and is "working very closely" with communities.
Telford and Wrekin Council says it has "learned a lot of lessons" and is constantly on the lookout for signs of child sexual abuse.
Writing in the Mail on Sunday, the Prince of Wales describes how, as he approaches his 70th birthday this year, he has been re-appraising what The Prince's Trust, and his other charities, have achieved during the past 40 years.
Prince Charles describes his concern about the decline in traditional skills, such as stone masonry and carpentry.
He is setting up a new organisation called The Prince's Foundation, to try to help people develop the skills to safeguard their communities.
Horse racing 'Brexit threat'
The Mail on Sunday suggests UK horse racing may be under threat if there is a hard Brexit, because free movement of the animals may not be allowed.
The paper says the warning has come from horse breeders and politicians in Brussels, ahead of this week's Cheltenham Festival. Mairead McGuinness, who's the Irish vice-president of the European Parliament, tells the paper that racing "depends on the best horses moving freely across Ireland, the UK and France". Government sources say they are committed to maintaining the existing arrangements.
Finally, the Observer reveals that, as well as being used to find explosives and drugs, sniffer dogs could soon be instrumental in efforts to stop the illegal smuggling of antiquities.
The paper explains that extremist groups are increasingly generating cash by selling cultural artefacts seized in conflict zones such as Iraq and Syria.
A project has been set up in the United States called "K9 Artifact Finders".