The official advice from Royal Mail at
https://personal.help.royalmail.com/app/answers/detail/a_id/5317/~/international-incident-bulletin changes almost daily. A number of countries to which delivery services were suspended, for the reason that transport links were unavailable, have been restored, but with the advice there is a backlog of mail. However, the fact that the situation changes daily means that anyone is taking a risk, because the service may stop or start abruptly.
I can only speak for myself, but Fighting 15s is currently only delivering to the UK, the EU, Norway, Switzerland, Australia, Canada and the USA.
The day I sent a good sized order to New Zealand was the day that 8 hours later service to that country was suspended. That’s why other businesses may take a different view on where they can safely rely on sending orders.