(Reuters) -Ukraine’s shelling of the city of Donetsk on Monday killed four people, a Russian-installed official in the eastern region of Ukraine said, while Russia’s air attacks on several Ukrainian regions killed at least one person, local officials said. Thirteen people were also injured in “heavy shelling” by Ukrainian forces on the centre of Donetsk, Denis Pushilin, the head of the Donetsk region, wrote on the Telegram messaging app. In a statement, the Russian Foreign Ministry called the shelling of Donetsk a “terrorist act” that it said was aimed at civilian infrastructure. Separately, a…