MOSCOW (Reuters) -Russia will respond to Ukraine's latest attacks as and when its military sees fit, the Kremlin said on Thursday, accusing Kyiv of state terrorism and confirming that President Vladimir Putin had told Donald Trump that Moscow was obliged to retaliate.

Ukraine used drones to strike Russian heavy bomber planes at air bases in Siberia and the far north at the weekend, and Russia also accused it of blowing up rail bridges in the south of the country, killing seven people.

Kremlin spokesman Dmitry Peskov, at his daily briefing with reporters, highlighted comments made by Putin a day earlier about the railway attacks.

"The president described the Kyiv regime as a terrorist regime, because it was the regime's leadership that consciously gave the order, the command, the order t

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