BUCHAREST, Romania (AP) — Broken promises of help from the West. A tragic history of Russian invasion that goes back centuries. A painful awareness that conflicts in this volatile region are contagious. These are the factors that make nations across Eastern Europe watch events in Ukraine — and tremble.

From leaders to ordinary people, there is a palpable sense of fear that Russia, seemingly able to thumb its nose at Western powers at will, may seek more opportunities for incursions in its former imperial backyard. The question many people are asking is: Who’s next?