I saw this yesterday in our local ABC news about a couple of Americans who were detained and deported back to the US from Zurich due to non-compliance to Switzerland's travel restrictions.
CA couple arrested for trying to board their connecting flight in Switzerland during COVID
"I was in a state of shock, in the basement, surrounded by police with giant rifles:" The couple was headed to Greece when Swiss officials refused to let them board their connecting flight -- deporting them instead.
abc7news.com