A Chinese and U.S. flag at a booth during the first China International Import Expo in Shanghai, November 6, 2018.

Investors look set to make money when Washington and Beijing sign their "phase one" trade deal — but in the long term, the Sino-U.S. trade war is "unresolvable," according to one analyst.

Speaking to CNBC's "Squawk Box Europe" on Tuesday, Patrick Armstrong, CIO of Plurimi Investment Managers, said holding any asset ahead of the agreement being finalized would definitely pay off.