DUBAI, July 22 (Reuters) - The Trump administration backs a nuclear energy pact with Riyadh allowing Saudi Arabiato enrich uranium and process spent atomic fuel, two sources have said, a move that may worry regional states concerned about weapons proliferation.Here are some of the main issues at play:WHAT HAS HAPPENED SO FAR?Washington and Riyadh have for years been discussing a nuclear cooperation deal that would give Saudi Arabia access to U.S. technology and American companies a chance to win big contracts for Saudi atomic energy facilities.

The deal is expected to be a financial windfall for American companies but is likely to raise concerns of nuclear proliferation in the Middle East.

The agreement includes a number of worrying U.S. concessions, raising concerns that Saudi Arabia is taking advantage of its close financial ties to the Trump family.