The action followed clashes between demonstrators and police on U.S. campuses and a blockade at Paris's Sciences Po university
Russia’s Defence Ministry said earlier on Thursday that it had scrambled fighter jets to intercept a US B-52 strategic bomber after it began flying toward Russia’s borders.
“In general, I will limit myself to only saying that of course such actions by the United States do not lead to a strengthening of an atmosphere of security and stability in the region that directly adjoins Russia’s borders,” Kremlin spokesman Dmitry Peskov told reporters on a conference call.
“On the contrary, they create additional tensions.” Russia’s European exclave of Kaliningrad is on the Baltic Sea.