The Czech Republic has signalled its support for new rounds of European Union enlargement, as the country prepares to mark 20 years since its own accession to the bloc. Enlargement is a “geostrategic necessity,” said Czech President Petr Pavel at a press conference in Prague, together with German President Frank-Walter Steinmeier at a conference on the accession of the Czech Republic and nine other states to the EU 20 years ago. “If we leave the Western Balkan states, Ukraine, Moldova and Georgia on the doorstep for too long, we will leave them at the mercy of actors like Russia, who do not me…