The first flight of SpaceX’s Dragon capsule

Stymied by Russian government dithering that has indefinitely grounded a launch on a modified Soviet-era missile, Iridium officials say that SpaceX agreed to move up to July the first of seven Falcon 9 launches from California with the company’s next-generation mobile communications satellites.

A SpaceX Falcon 9 rocket lifted off from Cape Canaveral at 7:10 p.m. EST Monday (0010 GMT Tuesday) with the JCSAT 18/Kacific 1 communications satellite, heading for a position in geostationary orbit to beam broadband signals across the Asia-Pacific. The launcher deployed the satellite into an on-target orbit, and the first stage returned to land on SpaceX’s drone ship in the Atlantic Ocean.

SpaceX’s launch director halted a countdown Tuesday to replace a sensor on the upper stage of a Falcon 9 rocket set to blast off with the GovSat 1 communications craft, the product of a joint venture between the commercial satellite operator SES and the government of Luxembourg.