Vladimir Putin
'For Putin, this is return on his investment.'
'These childish actions show the lack of seriousness of the caller and those behind him.'
'How could this ever happen?'
The five things you need to know about politics today
Skripal reportedly wrote to the Russian president asking for 'complete forgiveness'.
Boost for Prime Minister in diplomatic stand-off with Putin.
Foreign secretary 'deeply concerned' about safety of England fans.
US President had promised to back Theresa May 'all the way'.
'There is no other conclusion' but Russia's culpability, May said.