Why do most European countries not apply to regional trade pacts outside of Europe like the RCEP and the CPTPP?
United Kingdom: The British Foreign Affairs Committee urged the UK Government to assess membership of the RCEP, as part of the UK's 'Indo-Pacific tilt'.
In January 2018, the government of the United Kingdom stated that it was exploring membership of the CPTPP to stimulate exports after Brexit and had held informal discussions with several of the members. The United Kingdom is qualified to join CPTPP as it has sovereignty over the Pitcairn Islands in the Pacific Ocean. In October 2018, Japanese Prime Minister Shinzo Abe said he would welcome the United Kingdom joining the partnership post-Brexit. Liz Truss, the UK Secretary of State for Trade, expressed in a joint Daily Telegraph article with Simon Birmingham, David Parker, and Chan Chun Sing, the trade ministers of Australia, New Zealand, and Singapore, the intent of the United Kingdom to join the CPTPP.
So it seems to me that you can actually apply to these regional trade deals even if you're not part of the region geographically, but what surprises me is that most European countries choose not to do so for some reason, I am thinking it might be due to some complications related to the EU, but maybe I am wrong. Is there a reason for so few countries in Europe wanting to join these trade pacts?