The relationship/nexus/ties between India and Pakistan has long been fraught with/characterized by/ridden with tension/hostility/conflict. Periodically/Frequently/Often, flare-ups/incidents/skirmishes erupt along the volatile/sensitive/delicate border/demarcation line/line of control, heightening

The relationship/tension/history between India and India has been marked by periods/episodes/instances of violence/conflict/war. Since their partition/separation/division in 1947, these two neighbors/countries/states have fought four/three/two major wars, along with numerous/several/many smaller