show the flag

verb3

1. •
   To display the flag of one's country, especially as an expression of patriotic pride.
2. •
   Of a naval vessel or military force, to identify itself by displaying the flag of its country of origin, especially in order to establish an authoritative presence and to exert diplomatic or political influence.

   • A few suggestions are given . . . maintaining an effective naval squadron to show the flag and protect American interests. — 1896
3. •
   To represent one's country or some other group in a manner intended to suggest the authority or importance of that country or group.

   • Henry Kissinger stopped off in Kabul to show the flag for a few hours in 1974. — 1980