Military personnel from the US and Portugal are also taking part.
Military personnel from the US and Portugal are also taking part.
The suspects – who are Polish citizens, according to the Lithuanian authorities – are facing charges of acting on behalf of a foreign country’s security services.
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The Polish authorities have also readied a medical train that can transport the wounded from the border.
Poland has also been helping facilitate the repatriation of third-country nationals – including Bangladeshis and Filipinos – from Ukraine.
RT (formerly Russia Today) is among the channels removed.
“We will show our Ukrainian brothers solidarity and support” during “these difficult times”, says Poland’s interior minister.
Britain’s Sky Sabre air defence system was only unveiled last month, and will now be deployed to Poland.
Poland has condemned Russia’s “brutal, unprovoked and unjustified attack” and pledged it “will not leave Ukraine without support”.
The “Bucharest Nine”, a group of eastern NATO member states, will discuss the situation around Ukraine and its impact on regional security.
The West’s “weak” response to Russian actions against Ukraine in 2014 “is why today we have the next stage”, says Poland’s defence minsiter.
Poland will soon be “almost entirely independent from Russia gas”.
“It’s ironic that what Mr Putin did not want to see happen was a stronger NATO on his flank, and that’s exactly what he will see,” said Lloyd Austin.
Poland and the UK pledged to “stand in unity with Ukraine” and warned that “no state can consider any part of Europe as its sphere of influence”.
“Poland’s borders are sacred” and have been “sanctified by the blood” of past generations who defended them, said Mateusz Morawiecki.