Belgium's three largest trade unions have launched a three-day nationwide strike, causing severe disruptions to public transport and rail services, with SNCB operating only one in two or three trains and Eurostar canceling several Brussels-Paris services.Major interruptions affect buses, metro, trams and Brussels airports, and the strike is set to expand to public services and culminate in a full strike with all departure flights canceled.The action targets government austerity reforms under Bart De Wever's coalition and a multi-year budget plan, while unions including FGTB and ACLVB demand tax revisions, fair pensions, and protest labor market and welfare changes.