Slovak truckers are threatening to block the country's main border crossing with Ukraine from December 1 unless steps are taken to limit competition from Ukrainian hauliers, the head of the country's truckers association UNAS said. The threat on November 28 comes after action by Polish truckers who have been blocking several crossings with Ukraine for three weeks to demand tougher conditions for Ukrainian peers. Polish and Slovak truckers complain they offer cheaper prices for their services and also transport goods within the European Union, rather than just between the bloc and Ukraine.