Sviatlana Tsikhanouskaya said her children write to their father in prison.
Labour's shadow chancellor said national security "has got to come first" following alarm over spy balloons.
All these UFOs making headlines seem to have come out of nowhere.
The prime minister said the government would do “whatever it takes” to keep the country safe.
The UK is to launch a security review over how it monitors its own skies following the series of suspicious objects spotted over North America.
The Pentagon said the balloon was carrying sensors and surveillance equipment, but China has maintained that the balloon was used mainly for meteorological research.
It sounds too bizarre to be real – but there is definitely something lingering in the sky above Montana...
Transport secretary Mark Harper said one in 45 people in the UK currently has Covid-19.
Other countries, including the US, France and India, have also imposed testing.
″We know that things can quickly get out of hand," Dr Amir Khan warned.