Geoblocking in such cases would not be sufficient. For one thing your geo-IP database will never be perfectly accurate, even without considering that “data subjects who are in the Union” can connect to your site via proxies or VPNs with non-EU IP addresses. For another you still need to respond to GDPR requests e.g. to remove data collected on a data subject currently residing in the EU, even if the data was collected while they were outside the EU, and you can’t do that if you’re blocking their access to the site. For a newspaper in particular the same would apply to any EU data subject they happened to report on, whether they had previously visited the site or not.