KYIV, Ukraine (AP) – Multiple explosions believed to be caused by missiles have struck the western city of Lviv as Ukraine braces for an all-out Russian assault in the east. President Volodymyr Zelenskyy vowed to “fight absolutely to the end” in strategically vital Mariupol, where resisters and civilians are holed up in a sprawling steel plant laced with tunnels. AP staff witnessed the explosions in Lviv, which has been a relative haven from the fighting elsewhere in the country. Lviv Mayor Andriy Sadovyi said five missiles struck the city and that emergency services were responding. Capturing the port city of Mariupol would free Russian troops for a new offensive in the east and fully secure them a land corridor to the Crimean Peninsula.