amman jordan say monday work russia roll plan end fight southwestern syria fast possible time part peace pact border area broke amman moscow washington jordan russia foreign minister meet amman discuss progress set de-escalation zone particularly sensitive region include syrian territory neighbor israel neither side give detail stick point diplomats tell reuters include final position fight force u.s. unease russian involvement police deal reopen key border cross russia back syria government civil war unite state back rebel force seek topple president bashar al-assad meet secretly jordan june announce ceasefire syria southwest month late truce first peacemaking effort war u.s. government president donald trump reduce fight mean lead longer-lasting de-escalation step toward full settlement six years complex war express support resolve issue relate de-escalation zone performance russian foreign minister sergei lavrov tell reporters amman goal set de-escalation zone fast possible time jordanian counterpart ayman safadi say priority border secure mean daesh nusra sectarian militias safadi add refer islamic state rebel force link al qaeda operate syria official two senior diplomats tell reuters power make progress draw map de-escalation zone include quneitra province border israel alongside southern deraa province adjoin jordan official diplomats say washington also secure understand moscow militias back syrian government ally iran must push 40 km 25 miles border might help allay israeli jordanian concern presence lebanon iran-backed hezbollah group area diplomats say lavrov also press jordan re-open nasib border cross syria something amman far resist say need security strongly back broad de-escalation deal see pave way eventual return tens thousands refugees territory rebel say ceasefire remain fragile fear syria army return attack consolidate gain north areas insurgents say de-escalation zone merely free syria army make territorial gain elsewhere syria army support russian air power iranian-backed militias recent weeks gain string post along border jordan southeastern syria zone outside ceasefire area russia jordan agree speed de-escalation zone south syria