LONDON (Reuters) – Ukraine’s longer-dated dollar bonds suffered their worst day on record on Wednesday as the standoff between Moscow and Washington over the country showed little signs of abating. Ukraine’s 2040 GDP-linked bond tumbled as much as 12.3 cents to 45.75 cents in the dollar, suffering its worst daily drop since issuance in 2015. Prices slipped to levels last seen in 2017, data from Tradeweb showed. The 2032 bond dropped nearly 9 cents to fall to a record low of 63.187 cents. The conflict over Ukraine has ratcheted up sharply since Russian President Vladimir Putin recognised two br…