Former US Secretary of State Hillary Clinton tried to clarify comments that left the impression she had compared Russian President Vladimir Putin to Nazi dictator Adolf Hitler.
In an appearance at the University of California, Clinton said: "The claims by President Putin and other Russians that they had to go into Crimea ... because they had to protect the Russian minorities.
"That is reminiscent of claims that were made in the 1930s when Germany under the Nazis kept talking about how they had to protect German minorities in Poland and Czechoslovakia".
"I just want everybody to have a little historic perspective - I'm not making a comparison certainly, but I am recommending that we perhaps can learn from this tactic that has been used before".
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Former US Secretary of State Hillary Clinton paid tribute to Nelson Mandela, calling his death "the loss of a giant among us".
Ms Clinton said Mandela had "demonstrated unequivocally how each of us can choose how we will respond to those injustices and grievances, those sorrows and tragedies that afflict all of human kind".
Former US Secretary of State Hillary Clinton, who is considering whether to make her second challenge for the Democratic presidential nomination in 2016, said "people need to be better informed".
She made the comments in reference to revelations leaked by former US spy agency contractor Edward Snowden.
We need to have a sensible adult conversation about what is necessary to be done, and how to do it, in a way that is as transparent as it can be, with as much oversight and citizens' understanding as there can be.
It would be going down a wrong path if we were to reject the importance of the debate, and the kinds of intelligence activities that genuinely keep us safe.
This is a problem that is well over a decade old, where these capacities have corresponded with increasing outreach to consumers on the business side and increasing concern about security on the government side.
Former US Secretary of State Hillary Clinton has called for a "sensible adult conversation" about the boundaries of state surveillance following the leaking of secret files by whistleblower Edward Snowden.
Mrs Clinton said it would be "going down a wrong path" to reject a debate in the wake of disclosures about the collection of communications data by America's National Security Agency (NSA) and the Government's secret eavesdropping station GCHQ.
Speaking at Chatham House in London, where she collected a prize for her contribution to international diplomacy, Mrs Clinton told the Guardian: "This is a very important question. On the intelligence issue, we are democracies thank goodness, both the US and the UK."
Former US Secretary of State Hillary Clinton has been presented with this year's Chatham House Prize in recognition of her contribution to international diplomacy.
The central London institute also commended Mrs Clinton for her work towards gender equality and opportunities for women and girls.
The annual prize is awarded at Banqueting House in Whitehall to the statesperson deemed to have made the greatest contribution to improving international relations in the previous year.
Former US secretary of state Hillary Clinton was awarded an honorary degree from St Andrews University in Scotland today.
She took part in a formal procession through the town, which was watched by many Americans, before the graduation ceremony in the university's Younger Hall.
Former US secretary of state Hillary Clinton will receive an honorary degree from St Andrew's University later today and will make a special graduation address marking 600 years of Scotland's oldest redbrick.
The award will also mark her efforts to champion the causes of education, human rights, democracy, civil society and promoting opportunities for females around the world, according to the university.
The former first lady is not the only person receiving an honorary degree. Former Archbishop of Canterbury Rowan Williams will join classicist Professor Mary Beard, primatologist Dame Jane Goodall and particle physicist Professor Peter Higgs at St Andrew's to collect their honorary degrees.
Other famous names being bestowed with honorary degrees are, anthropologist Professor Dame Marilyn Strathern, philosopher Professor Nancy Cartwright and inventor of the world wide web Professor Sir Tim Berners-Lee.
Former US Secretary of State Hillary Clinton has tweeted her congratulations to the Duke and Duchess of Cambridge:
Congratulations from across the pond to the Duke and Duchess! Wishing you the best of luck and a bit of advice: It Takes a (Royal) Village!