Both UK and EU officials are concerned that talks on brexit could fail, as little progress has been made on some of the key issues identified as the biggest obstacles as early as March. As talks on the future relationship between the two sides resume this week, British negotiators are trying to break the deadlock by submitting a draft free trade agreement based on a common position with the EU, people familiar with the matter said. But so far, this strategy has not made a breakthrough. < / P > < p > when the two sides conclude this round of negotiations in Brussels on Friday, it is unlikely to make positive progress. Michelle Barnier, the EU’s chief negotiator, and David Frost, the UK’s chief negotiator, are expected to highlight the deep differences that remain, according to people familiar with the matter. The most important ones are the right of access to the fishing waters of the United Kingdom and the so-called fair competition environment requirements aimed at preventing competition distortion. The failure to reach an agreement in the end will lead to trade between the UK and the EU in the form of tariffs and quotas, and lead to an abrupt end to cooperation in various fields from police to aviation. < / P > < p > If any agreement is to be implemented in time before the end of the post brexit transitional period on December 31, the last round of negotiations scheduled to end on October 2 will be considered the deadline.