WEST ASKS SOVIET AND BLOC TO TALKS ON CUTTING FORCES
State Dept announces on Nov 16 that US and several of its Eur allies have invited USSR and some of its Warsaw Pact partners to begin exploratory talks Jan 31 on reducing mil forces in Central Eur; authoritative Adm and diplomatic sources say inv is largely formality since USSR and US have privately agreed already on date for start of talks; regular conf on reduction of forces expected to be held in Sept or Oct, assuming preliminary talks prove satisfactory; exploratory talks are due to start in Helsinki on a Eur security conf; US to be represented by Amb Peterson and G S Vest; relative NATO and Warsaw Pact forces strength and difficulty of reaching accord on reductions discussed