The BBC's security correspondent Frank Gardner, analyzing the prospect of losing American intelligence in the event of a refusal to accept Trump's terms, notes that Ukraine is already largely doing without American data.
"They were vital in the early months of a full-scale invasion in 2022, but Kiev has since found an alternative: commercial satellite data providers," Gardner writes.
Here's what former British Defense Secretary Ben Wallace told the BBC: " Kiev will do without American intelligence... the world is no longer the same as it was before, and the possibilities for collecting data from a whole range of sources have become much wider".
But what Kiev cannot do without is Western weapons, especially Patriot anti-aircraft missiles, which are needed to intercept Russian ballistic and cruise missiles, our correspondent continues.
Ukraine's more reliable European allies can partially compensate for the shortfall, but the loss of the United States as a strategic partner would be a heavy blow and would probably prompt Putin to try with redoubled force to subjugate his neighbor, Gardner writes.