1. Former Foreign Minister of Poland Radek Sikorski walking next to office building
2. Sikorski walks inside office
3. SOUNDBITE (English) Radek Sikorski, former Foreign Minister of Poland:
"We could get into a psychology of a bank run in which other countries have referenda, and with all the manifold crises that Europe is dealing with, we could see at least the weakening of an arrangement that has given Europe the longest period of peace and prosperity."
4. Sikorski during interview
5. Close up on Sikorski's hands
6. SOUNDBITE (English) Radek Sikorski, former Foreign Minister of Poland:
"Russian media, Russian troll factories, Russian money is supporting Brexit. It makes sense that Russia would like to deal with Europe one-by-one and not with the European Union as a whole. That would strengthen Russia’s negotiating position vis-a-vie every member state. What surprises me is that some people in smaller countries don’t see that."
7. Close on Sikorski's face
8. Sikorski during interview
9. SOUNDBITE (English) Radek Sikorski, former Foreign Minister of Poland:
"I think EU is being blamed for a general perception that the island is overcrowded and general pan-European fears about identity and multi-ethnic relationships that, I think, have much more to do with Britain's colonial past than with membership in the EU."
10. Various of Sikorski outside office
11. Close of Polish, EU and NATO flags in front of Presidential Palace
Radek Sikorski, a former Polish foreign minister with longstanding ties to Britain, says he is "very worried" British voters could opt to leave the European Union, fearing it could weaken a political arrangement that has given Europe its longest-ever period of peace and prosperity.
Sikorski argued on Monday that a weaker EU would be particularly risky for nations like his own, which has historically been at the mercy of its large neighbours Russia and Germany.
He also argued that it threatens to leave Britain more isolated and economically weaker.
Britain is holding a referendum on June 23 to decide whether to leave the EU or remain.
The possibility of Brexit, as a British departure from the EU is called, poses a major existential crisis to the 28-member bloc, which is also being sorely tested by the migration crisis.
Sikorski, one of Poland's most internationally prominent leaders in recent times, said he believes that Brexit carries the risk of "a psychology of a bank run in which other countries have referenda, and with all the manifold crises that Europe is dealing with, we could see, at least, the weakening of an arrangement that has given Europe the longest period of peace and prosperity".
Sikorski, who has also held the position of defence minister and speaker of parliament in Poland and is now a senior fellow at Harvard University, argued that a weaker EU would help Russia.