“ this spearhead … could include several thousand troops , ready to respond where needed with air , sea and special - forces support , ” nato secretary - general anders fogh rasmussen told a news conference monday in brussels . nato ’s existing response force takes five days for the first units to arrive . ukraine 's national security council , told russia 's ria news agency that " the military infrastructure of nato member states " was " getting closer to [ russian ] borders , including via enlargement " . nato leaders are set to approve a rapid - reaction military force , drawn from their respective defence capabilities , that could be deployed to a crisis in eastern europe within two days , alliance officials say . nato leaders where the western military alliance will give itself the power to respond to threats more quickly in the face of russia ’s continued effort to destabilize and break up ukraine . this summit , originally meant to mark the end of the nato - led mission in afghanistan , will instead signal a kiev moscow ukrainian president petro poroshenko accused russia on monday of " direct and undisguised aggression " which he said had radically changed the battlefield balance as kiev 's forces suffered a further reverse in their war with pro - moscow separatists . european union leaders decided at a summit on saturday that the direct image copyright reuters image caption tensions between russia and nato countries are high over the ongoing conflict in ukraine , blamed kiev 's presence in eastern europe , a top russian official says . mikhail popov , a kremlin adviser , said that deteriorating relations with the us and nato would be reflected in the updated strategy .