Putin's 3-day ceasefire comes into effect, but Ukraine claims Russia already broke it

By Ivana Kottasovà¡, CNN (CNN) — A three-day ceasefire in Ukraine that was unilaterally declared by Russian President Vladimir Putin last month has come into effect, as Russia prepares to mark the anniversary of its World War II Victory Day on Friday. Russian state media agency Tass said the ceasefire began at midnight local time on Wednesday (5 p.m. ET Wednesday). Within three hours, Ukraine's air force had claimed Russia had launched guided bombs over Sumy in the north of Ukraine, the Reuters news agency reported, adding that it could not independently verify the claims. A statement from the Kremlin…