They said the tanks crossed about 200 meters into northern Gaza, in an area where they have operated frequently in the past. No clashes were reported.
The Israeli military had no immediate comment.
Israel has begun military operations against Gaza militants who have fired dozens of rockets at Israel in the past three days. Up to now the operations have been confined to airstrikes.
The majority of experts in the field of armaments admit that made-in-Russia weapons can be referred to as best weapons in the world. To substantiate this point, suffice it to recall that many countries make their own ripoffs of world-famous Russian weapons.