moscow kremlin say thursday possible meet russian president vladimir putin u.s. president donald trump vietnam week still discussion nothing yet agree russian news agencies cite kremlin aide yuri ushakov early thursday say two leaders would meet friday asia-pacific economic cooperation apec summit vietnam kremlin spokesman dmitry peskov tell conference call reporters time place format meet still discuss friday meet possibility content meet agree agenda say peskov give trump putin attend apec summit peskov say paths would cross one way another possible putin-trump meet vietnam still discussion kremlin