Donald Tusk speech about Article 50 being triggered

The transcript discusses the initiation of Brexit negotiations by Theresa May, highlighting the mixed emotions among Europeans and British voters. Despite the challenges, Brexit has united the EU27, strengthening their resolve. The EU is focused on protecting its interests and minimizing costs for its citizens and businesses during the negotiations. Future proposals will be discussed in a press conference with Prime Minister Joseph Muscat.

What does the speaker imply about the future of the EU after Brexit?

What is the main goal mentioned regarding the negotiations?