MOSCOW (Sputnik) — Instead, he will proceed with parliament consultations on laws necessary to continue cooperation with the International Monetary Fund (IMF), the president's website said in a statement.
Poroshenko was expected to arrive in Britain on May 11.
"This is the case when internal policy makes adjustments to the international activity. I will continue to consult with lawmakers," the president said commenting on the cancellation, as quoted in the statement published on Tuesday.
The domestic situation was also complicated by the appointment of the new attorney general, according to the website.
The Ukrainian government highly relies on IMF assistance since economy severely deteriorated as an armed conflict between government forces and militia in the country's southeast escalated in April 2014.