Students reportedly warned they could face sanctions, including a lower conduct grade, for wearing the jerseys.
The prime minister of Bosnia and Herzegovina's Republika Srpska entity said the country's future should be determined by its own peoples, as Washington pushes for a single candidate for the post of High Representative.
Kremlin spokesman Dmitry Peskov said Russia has historical, traditional and close ties with Republika Srpska ahead of the meeting.
The meeting was part of Prime Minister Sharif's ongoing diplomatic engagements on the sidelines of international gatherings.