Poland is preparing the ground on its border with Russia for the laying of anti-tank mines and could have the frontier protected within 48 hours in a crisis, a deputy defense minister has said. The government is gearing up production of anti-tank ordnance and making preparations for a mining operation as it boosts its defenses against a possible invasion amid fears of an aggressive Russia.  JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official . Poland is preparing to