The USS Michigan, an American nuclear-powered guided-missile submarine, has arrived in Busan, South Korea in what US officials have described as a show of force amid escalating US-North Korea tensions.
The submarine's arrival also comes amid concerns of another North Korean missile or nuclear test.
The submarine's deployment follows that of the aircraft carrier USS Carl Vinson.
French presidential candidate Marine Le Pen announced she is stepping down as leader of the far-right National Front; however, she indicated the move will be temporary.
The decision is being seen as an attempt to garner votes from supporters of the candidates defeated in the first round.
Le Pen will face centrist Emmanuel Macron in the second round.
The US has imposed "sweeping" sanctions on 271 employees of the Syrian Scientific Studies and Research Centre (SSRC).
The SSRC is a Syrian government agency which the US believes created the nerve agent that killed 87 people in a chemical attack in the rebel-held town of Khan Sheikhoun.
The US blames Syrian President Bashar al-Assad's regime for the attack which has denied its role.