Ebuya wins the men's title by six seconds from Medhin
Kenya dominated the World Cross Country Championships in Poland, winning both senior races and the team events.
Joseph Ebuya completed the 12km course in 33 minutes to win the men's title, ahead of Eritrea's Teklemariam Medhin and Uganda's Moses Ndiema Kipsiro.
Mo Farah was Britain's best finisher, 70 seconds off the pace in 21st.
Emily Chebet beat Kenyan team-mate Linet Masai in a sprint finish to win the women's 8km race in 24:19. Steph Twell led the GB challenge in 23rd.
She led the British team to sixth place with the backing of Faye Fullerton (33rd), Freya Murray (37th) and Stevie Stockton (47th).
Hayley Yelling, who won the 2009 European title in December, finished down in 63rd.
Farah was returning to international action after a bout of illness but still finished well ahead of team-mates Andy Vernon (44th), Mike Skinner (65th) and James Wilkinson (107th) as GB's men finished 14th.
Nobody could touch the Kenyans, who occupied four of the first six places in the women's race and five of the top nine in the men's event to also claim the team titles.
Kenyan athletes also filled the first four places in the junior women's and junior men's races.
In the junior women's team event, the GB line-up of Kate Avery, Emelia Gorecka, Annabel Gummow, Hannah Walker, Beth Potter and Sarah Inglis finished fifth overall. GB's junior men's team came ninth.