  We report on European VLBI Network (EVN) and Very Large Array (VLA)
observations of SDSS J0836+0054, the most distant radio-loud quasar known at
present z=5.774). The source, with a total flux density of 1.1 mJy, shows a
compact structure at 10 mas angular resolution at 1.6 GHz frequency, with no
indication of multiple images produced by gravitational lensing within a 4x4
arcsec field above the brightness level of 100 microJy/beam. More recent 5 GHz
EVN observations are being analysed now. As a by-product, a two-sided mas-scale
jet structure is suspected in one of the phase-reference calibrator quasars,
PKS 0837+012.
