John Kerry, US secretary of state, said on Saturday he joined his European counterparts in condemning an assault by pro-Russia rebels on Mariupol, Ukraine, and called on Russia to end its support for the rebels.
At least 30 people died in Mariupol, a strategic city linking rebel territory with Russian-occupied Crimea, on Saturday. The local mayor’s office said 97 people were also wounded when missiles struck a crowded residential district early in the morning and then again shortly after midday.
“It is reprehensible that the separatists are publicly glorifying this and other offensives in blatant violation of the Minsk agreements they signed,” Kerry said in a statement issued while on a visit to Zurich.
Related: Missile attacks kill at least 30 in Mariupol, east Ukraine
Kerry said the separatists’ assault has been aided by Russia’s “irresponsible and dangerous decision to resupply them in recent weeks with hundreds of new pieces of advanced weaponry, including rocket systems, heavy artillery, tanks, armored vehicles, in addition to continuing operational command and control”.
“We call on Russia to end its support for separatists immediately, close the international border with Ukraine, and withdraw all weapons, fighters and financial backing. Otherwise, US and international pressure on Russia and its proxies will only increase,” Kerry added.