Warsaw: Tens and thousands of Polish farmers and supporters staged violent protests outside Prime Minister Donald Tusk’s office in Warsaw and clashed with the police, threatening to bring the country to a standstill if their demands were not met. The protesters are protesting against the European Union’s proposed climate deal and cheap Ukrainian food imports they say harm their livelihoods.Warsaw: Tens and thousands of Polish farmers and supporters staged violent protests outside Prime Minister Donald Tusk’s office in Warsaw and clashed with the police, threatening to bring the country to a standstill if their demands were not met. The protesters are protesting against the European Union’s proposed climate deal and cheap Ukrainian food imports they say harm their livelihoods.