Russia’s lower house of parliament ratified an overarching partnership treaty with North Korea on Thursday, as South Korea considers its response to North Korean troops in Russia. The partnership treaty takes military cooperation between the two countries to a new level and stipulates that they will provide mutual assistance should either country be attacked. The ratification was the final stage for the agreement signed by Russian President Vladimir Putin and North Korean leader Kim Jong Un in Pyongyang in June. “The treaty takes full account of the current geopolitical situation,” said the he…