Following the finding on Romanian land of fresh components of a drone resembling those used by the Russian military, the foreign ministry of Romania summoned the Russian charge d’affaires, the Agerpres website reported on Sunday.

In the midst of Russian attacks on Ukraine’s river ports and only a few hundred meters from the Romanian border, Romanian officials discovered the second set of drone fragments that had landed in the NATO member state in a week on Saturday.

The attacks have increased security risks for NATO whose members have a mutual defence commitment.

“…The charge d’affaires of the Embassy of the Russian Federation in Bucharest was urgently summoned on Saturday to the Ministry of Foreign Affairs, at the level of state secretary,” the foreign ministry said in a statement sent to Agerpres.

“State Secretary for Strategic Affairs Iulian Fota conveyed the protest of the Romanian side over the violation of Romania’s air space following the identification on (our) territory, near the border with Ukraine, of some drone fragments similar to those used by Russian forces in the aggression against Ukraine.”

On Saturday, President Klaus Iohannis said the discovery of the fragments pointed to an unacceptable breach of Romania’s air space.

NATO Secretary General Jens Stoltenberg said Russian strikes near the border were “destabilising” even if there was no indication Russia intended to hit Romania, a NATO member state.

Since July, when Moscow abandoned a deal that lifted a de facto Russian blockade of Ukraine’s Black Sea ports, it has repeatedly struck Ukrainian ports that lie across the Danube River border from Romania.

Ukraine is one of the world’s biggest grain exporters and the Romanian Black Sea port of Constanta is now Kyiv’s largest alternative export route, with grains arriving by road, rail or barge across the Danube.