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U.S. ne­go­tia­tors worked on a pro­posed par­tial cease­fire in the 3-year-old war in Ukraine on Mon­day, meet­ing rep­re­sen­ta­tives from Rus­sia one day af­ter hold­ing sep­a­rate talks with a team from Kyiv.

It has been a strug­gle to reach even a lim­it­ed, 30-day cease­fire — which Moscow and Kyiv agreed to in prin­ci­ple last week — with both sides con­tin­u­ing to at­tack each oth­er with drones and mis­siles.

One ma­jor stick­ing point is what tar­gets would be off-lim­its to strike, even af­ter U.S. Pres­i­dent Don­ald Trump spoke with the coun­tries’ lead­ers, be­cause the par­ties dis­agree.