WARSAW, Poland — A Ukrainian citizen allegedly working for Russian intelligence services as part of a sabotage campaign was detained in Poland, while two others were arrested in Romania, prosecutors said Tuesday.

Prosecutors said the individuals acting on behalf of the Russian intelligence services were allegedly preparing acts of sabotage involving the sending of shipments containing explosives and incendiary materials to Ukraine, which were intended to spontaneously combust or explode during transport.

The goal was to intimidate populations and destabilize EU countries supporting Ukraine, Polish prosecutors said, adding that two more Ukrainian citizens suspected of taking part in the same plot were detained in Romania.

Romanian authorities said Tuesday that two Ukrainians, aged 21 and

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