Judy Woodruff:

In the day's other news, Marriott announced that hackers have broken into the data banks of its hotel empire. The breach affects up to 500 million guests at hotels once run by Starwood and now owned by Marriott. It could involve credit card and passport numbers and other information.

We will discuss the implications, later in the program.

Ukraine escalated its standoff with Russia today, closing its border to all Russian men between the ages of 16 and 60 years old. President Petro Poroshenko said he wants to prevent more fighters from joining rebels already in Eastern Ukraine.

This follows Sunday's confrontation in the Kerch Strait, when Russian border guards seized three Ukrainian naval vessels and 24 sailors.

In Brussels, street battles broke out today at a protest over rising fuel prices and high taxes. Hundreds of people rallied, wearing high-visibility yellow vests. Some threw rocks and torched a police car, and police fired tear gas and high-pressure hoses. Officials condemned the violence, but protesters insisted they be heard.