BRUSSELS — European Union foreign ministers slapped travel bans and asset freezes on 21 people they have linked to the push for the secession and possible annexation of Ukraine’s Crimean peninsula.

The sanctions came hours after Crimea’s parliament on Monday declared the region an independent state, following its residents’ overwhelming vote to break away from Ukraine and seek to join Russia.

The ministers meeting in Brussels did not immediately release the names and nationalities of those targeted by the sanctions.