One of the ways of dealing with skvoznyaki in a modern apartment is to install a rubber door sealer, available in hardware stores. But here’s the thing: if you provide a large preload, the door because of stiffness of the rubber will close hard. If you reduce the tightness will worsen the tightness. I propose a very simple solution: fasten the door perimeter wooden laths with cross-section 25X25 mm, as shown in the figure. Now stretch the tube, adjacent to two planes, will reliably seal the gap.
I. BISIN, Omsk