By Tom Balmforth ZOLOCHIV, Ukraine (Reuters) -Ukraine’s President Volodymyr Zelenskiy called on the West to speed up deliveries of weapons systems as Ukrainian troops move to consolidate control over a large swath of northeastern territory seized back from Russia. Since Moscow abandoned its main bastion in northeastern Ukraine on Saturday, marking its worst defeat since the early days of the war, Ukrainian troops have recaptured dozens of towns in a stunning shift in battleground momentum. A senior U.S. military official said Russia has largely ceded territory near Kharkiv in the northeast and…