The gunmen raised Russian flags and banners at several government buildings in the capital of predominantly ethnic-Russian Crimea.
The violence serves as a reminder that, despite a historic accord with the Philippines' largest Muslim insurgent group, peace is not necessarily around the corner.
Reconstruction aid is arriving in Tacloban but its mayor is sparring with Philippine President Benigno Aquino. Both are scions of rival political families.
Emergency relief aid poured in immediately after Typhoon Haiyan hit the Philippines. But as the UN turns to long-term recovery, there is little money floating around.
Relocating US Marines on the Japanese island is a political hot potato that has been tossed before.