North Korea test-fired multiple short-range missiles Tuesday, its latest military provocation that comes just a day before an important national election in neighboring South Korea.

Turkey is ready to purchase the Patriot air defence system from the United States under certain conditions, but Ankara’s position on purchasing and keeping Russian S-400 air defence systems has not changed, Turkish Foreign Minister Mevlut Cavusoglu said on Tuesday.

China has sent a survey vessel involved in a standoff with Vietnam last year back into that nation’s exclusive economic zone this month, vessel-tracking data shows, in a move likely to fuel tensions between the two countries over their rival claims in the South China Sea.