The crisis has pushed more than 100 million more workers into poverty, the ILO said in its annual World Employment and Social Outlook report ahead of the conference.
But unionists say it contravenes the 1998 peace deal and London has said the Protocol is unsustainable in its current form after supplies of everyday goods to Northern Ireland were disrupted.
"But when they abandon enemy ranks and opt to live as ordinary Afghans in their homeland, they will not face any issues (and) hence they should not remain fearful."
A journalist onboard reported "an unusual noise" from the landing gear when the plane -- known as Air Force Two -- took off, but said that the landing was "completely normal."
According to him, over the last few weeks tour operators in Britain, France and Germany -- Spain's three main markets -- have been receiving a large number of enquiries.
"Laschet is still a long way from the chancellor's office," the Sueddeutsche Zeitung daily said. But the poll result has brought him "much closer to it".