One person was killed when a Russian military jet trainer crashed while attempting to land in a region bordering Russia-annexed Crimea, Russia's defense ministry said Monday.

The crash of the Czechoslovak-made L-39 in the Krasnodar region was the second fatal military crash on a training flight in three days. A Sukhoi-30 fighter plane crashed Saturday in the Kaliningrad exclave, killing both pilots.

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The ministry did not specify if anyone other than the victim was aboard the L-39, which is a twin-seater.

The Russian air force has suffered a string of crashes that some observers have attributed to a higher number of flights amid the fighting in Ukraine. Last month, two Russian fighter jets crashed while on training missions — one into the Pacific and one into the Sea of Azov.