https://github.com/termux/termux-packages/wiki/Mirrors#mirror-by-national-research-nuclear-university---moscow-engineering-physics-institutes

Main 	deb http://mirror.mephi.ru/termux/termux-main stable main
Root 	deb http://mirror.mephi.ru/termux/termux-root root stable
X11 	deb http://mirror.mephi.ru/termux/termux-x11 x11 main