The United States has offered Poland technical assistance in investigating the incident with a missile.

The United States has offered Poland technical assistance in investigating the incident with a missile that entered its airspace and is monitoring developments at the level of President Joe Biden, the White House said.

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The incident was the subject of a telephone conversation between Biden’s national security adviser Jake Sullivan and the head of the Polish National Security Bureau, Jacek Sever.

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“Mr. Sullivan expressed U.S. solidarity with Poland, our close NATO ally, as it deals with reports of a missile temporarily entering Polish airspace. Mr. Sullivan promised necessary technical assistance and assured his Polish counterpart that President Biden is closely monitoring the situation,” a press release said.

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Earlier, the Operational Command of the Polish Armed Forces stated that on Friday morning an unidentified air object entered Polish airspace from Ukraine, it was accompanied by air defense, and then disappeared from radar. The Polish Army General Staff later stated that it had identified the object that flew into Ukrainian airspace as a Russian missile, without providing further explanation.