Russia threatens to break diplomatic ties with Ukraine
Russia has warned it could break diplomatic ties with Ukraine over reported security incidents in Crimea, something it did not do even after annexing the disputed territory or throwing its support behind separatist rebels in the east.
State news agencies quoted prime minister Dmitry Medvedev as saying he would not like the ties to be severed but "if there is no other way to change the situation, the president could take this step".
