moscow president vladimir putin warn friday standoff north korea unite state close spill large-scale conflict say mistake try pressure pyongyang halt nuclear missile program putin due attend summit brics nations china next week say way de-escalate tensions via talk sergei lavrov foreign minister say washington pyongyang take initiative essential resolve region problems direct dialogue involve side without advance precondition talk putin whose country share border north korea write kremlin web site provocations pressure bellicose offensive rhetoric road nowhere russian leader whose nuclear-capable bombers recently overfly korean peninsula show force say situation deteriorate badly balance verge large-scale conflict pyongyang work develop nuclear-tipped missile capable hit unite state recently threaten land missiles near u.s. pacific territory guam monday north korea see joint war game unite state south korea preparations invasion raise stake fire intermediate-range missile japan russia opinion calculation possible halt north korea nuclear missile program exclusively put pressure pyongyang erroneous futile putin write road map formulate moscow beijing would involve north korea halt missile program exchange unite state south korea stop large-scale war game way reduce tensions write putin lavrov address students moscow say felt events build towards war say would cause large number casualties japan south korea happen want avoid war first step must take side intelligent strong say lavrov make clear refer unite state say russia work behind scenes moscow know washington back channel pyongyang say hop would allow two side de-escalate putin warn north korea situation verge 'large-scale conflict