Gao Yang understood what Number Thirteen meant. As an assassin, Number Thirteen often prepared for months or even longer for the assassination of a target. Any place where the target might appear could be considered a place to strike, and the target's main residence was of utmost importance.
The most important items are generally carried with oneself. Gao Yang didn't know the status of Princess Sissi's shotgun in Poloneshenko's mind, but it was very likely that after Poloneshenko moved into the Presidential Palace, he brought a few of his beloved collectibles inside. It's very likely and quite possible.
The gun might be in Poloneshenko's villa, or in his mansion in the Kiev City District. In the near future, of course, it might also appear in the Presidential Palace. Without being able to ensure the gun can be stolen within a short time, taking advantage of the current convenience to scout the terrain in advance would be a good choice.
