P203 CEEFAX 203 Wed 2 Mar 21:00/01       Leaders of the 16 NATO countries have said that Soviet military power casts a shadow over EuropeN They called at their Brussels suflht for the elimination of thousands of +arsaw Pact weapons which they said were held ready for a surprise attack. A statement on the imbalance in East- West conventional forces said NATO required "highly asymmetrical reductions by the EastbN Mrs Thatcher warned the sumlit that the Soviet Union was continuing to modernise its nuclear forcesN News index 102/202 Newsreel 119/219