Assault infantry to armour vehicle -- how it works ?

[Rosollia]

Your first question is can a sniper destroy a tank?
Answer is yes, also crewmen can destroy a tank. Basicaly any infantry unit with a hand grenade can destroy a tank in close assault.

Your second question is can an infantry section with AT-weapon that can only penetrate the top armor of the target tank destroy it?
Ofcourse it can if it hits the top armor. You can also imobilize the tank with a track hit. And at close assault the tank can be easily destroyed.