MOSCOW – Prime Minister Dmitry Medvedev said Friday Russia could break diplomatic ties with Ukraine over reported security incidents in Crimea, something it didn’t even do after annexing Crimea or throwing its support behind separatist rebels in the east.

State news agencies quoted Medvedev as saying that he wouldn’t like the ties to be severed but “if there is no other way to change the situation, the president could take this step.”

Russia annexed Crimea from Ukraine in March 2014 following a hastily called referendum, and a conflict between Russia-backed separatists and Ukrainian forces flared up in eastern Ukraine weeks later. Despite that and the conflict in the east, which has killed more than 9,500 people, Kyiv and Moscow didn’t break diplomatic ties.

Ukrainian Foreign Minister Pavlo Klimkin earlier this week also spoke of that possibility but said Kyiv wouldn’t want that because it would mean abandoning 4 million Ukrainians who live and work in Russia.

Medvedev’s announcement comes after Ukraine put its troops on combat alert Thursday along the country’s de-facto borders with Crimea, amid an escalating war of words with Russia over Crimea.

German Foreign Minister Frank-Walter Steinmeier on Friday appealed to Russia and Ukraine to avoid a further escalation in tensions after Moscow accused Kyiv of sending “saboteurs” to conduct attacks in annexed Crimea.

He said in comments published by the Welt am Sonntag newspaper that Germany is in contact with both countries, and he plans to speak with Russian counterpart Sergey Lavrov during a previously planned visit to Russia on Monday.

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Geir Moulson contributed to this report from Berlin.