If need be, investigators looking into a missile strike that killed two in eastern Poland on Tuesday will travel to Ukraine, the prime minister said on Friday.
The US secretary of state has said he has full confidence in the Polish investigation into a missile explosion in eastern Poland that left two people dead.
US President Joe Biden said evidence did not support Ukrainian President Volodymyr Zelensky's claim that a stray missile that exploded in Poland, killing two people, did not come from Ukraine.
The US has not seen anything that contradicts Poland's preliminary assessment that a Russian-made missile which landed within its borders on Tuesday was most likely the result of a Ukrainian air defence missile, said the United States Secretary of Defence.
Information obtained by the US indicates that the explosion caused by a Russian-made missile in south-eastern Poland on Tuesday, which killed two people, was an accident, the US ambassador has said.
US President Joe Biden has offered his "full support and assistance with Poland’s ongoing investigation" into an apparent missile explosion near the Ukrainian border on Tuesday.
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A framework agreement for the delivery of elements for US and Korean multiple launch rocket systems (MRLS) was approved on Wednesday by Poland's defence minister.
About 2,000 troops from the Visegrad countries as well as those from the US and the UK are taking part in the Puma-22 military exercise starting in Nowa Dęba, southeastern Poland, on Friday.
The current situation in Ukraine, the presence of US troops in Poland and Polish-US defence cooperation were the main subjects of a phone conversation between the Polish deputy PM and defence minister and the US defence secretary.