Hello, I'm Karen Giannone. This is BBC World News our headlines.

大家好 我是凯伦·吉奥妮 这里是BBC世界新闻头条

Martial law has come into effect in parts of Ukraine after a maritime clash with Russia on Sunday.

周日与俄罗斯发生海上冲突后 乌克兰部分地区的戒严令已经生效

The tensions prompted President Trump to say he might pull out of a meeting with President Putin this week.

鉴于乌俄之间的紧张局势 特朗普总统称其可能退出本周与普京总统举行的会议

Republicans in the United States have extended their majority in the Senate following a rerun election in Mississippi dogged by racial tension.

种族紧张关系导致密西西比进行了重新选举 之后 美国共和党扩大了其在参议院中的多数席位优势