WASHINGTON, Nov 28 - European countries should step up support for Ukraine in connection with the incident in the Kerch Strait, introducing more effective sanctions against Russia, U.S. State Department spokesperson Heather Nauert has said.

"And one of the things that we would like to see take place is our European allies doing more to assist Ukraine. The United States government has taken a very strong position in their support, in support of Ukraine. We would like other countries to do more as well," she said.