US Secretary of State John Kerry warned of "consequences" after his Russian counterpart made clear Moscow would respect the outcome of a referendum in Crimea this weekend on breaking away from Ukraine.
After more than five hours of face-to-face talks with Sergei Lavrov in London ended without agreement, Mr Kerry said any move by the Russian parliament to ratify a breakaway vote would amount to a "back-door annexation" of the region.
Foreign Secretary William Hague, who met with both men separately earlier, said the US and the EU could move to sanctions as early as next week it there was no easing of the tensions.
Mr Lavrov, however, was adamant that Russia would respect the will of the Crimean people as expressed in Sunday's vote.
The talks, held at the residence of the US ambassador, overran by more than two hours, raising hopes that a breakthrough was on the cards.
But Mr Lavrov finally emerged to tell reporters that there was no "common vision" on a way forward, while Mr Kerry said that he had put forward a series of "constructive ideas", only to be knocked back.
Mr Kerry said that he had reiterated President Barack Obama's warning that there would be "consequences" if Russia did not find a a way to "change course".
"If the wrong choices are made, then there will be no choice but to respond appropriately because of the gravity of this breach of international standard, this breach of international law," he added.
Mr Lavrov denied Moscow had plans for a "military intrusion" into the largely pro-Russian eastern Ukraine following clashes in the city of Donetsk between rival demonstrators, calling the claim "outrageous".
He said that despite the fact no deal was reached, the "talks were certainly useful to realise how we understand each other".
Below is an extract from a web page. Evaluate whether the page has a high educational value and could be useful in an educational setting for teaching from primary school to grade school levels using the additive 5-point scoring system described below. Points are accumulated based on the satisfaction of each criterion:

- Add 1 point if the extract provides some basic information relevant to educational topics, even if it includes some irrelevant or non-academic content like advertisements and promotional material.
- Add another point if the extract addresses certain elements pertinent to education but does not align closely with educational standards. It might mix educational content with non-educational material, offering a superficial overview of potentially useful topics, or presenting information in a disorganized manner and incoherent writing style.
- Award a third point if the extract is appropriate for educational use and introduces key concepts relevant to school curricula. It is coherent though it may not be comprehensive or could include some extraneous information. It may resemble an introductory section of a textbook or a basic tutorial that is suitable for learning but has notable limitations like treating concepts that are too complex for grade school students. 
- Grant a fourth point if the extract highly relevant and beneficial for educational purposes for a level not higher than grade school, exhibiting a clear and consistent writing style. It could be similar to a chapter from a textbook or a tutorial, offering substantial educational content, including exercises and solutions, with minimal irrelevant information, and the concepts aren't too advanced for grade school students. The content is coherent, focused, and valuable for structured learning.
- Bestow a fifth point if the extract is outstanding in its educational value, perfectly suited for teaching either at primary school or grade school. It follows detailed reasoning, the writing style is easy to follow and offers profound and thorough insights into the subject matter, devoid of any non-educational or complex content.

The extract:
US Secretary of State John Kerry warned of "consequences" after his Russian counterpart made clear Moscow would respect the outcome of a referendum in Crimea this weekend on breaking away from Ukraine.
After more than five hours of face-to-face talks with Sergei Lavrov in London ended without agreement, Mr Kerry said any move by the Russian parliament to ratify a breakaway vote would amount to a "back-door annexation" of the region.
Foreign Secretary William Hague, who met with both men separately earlier, said the US and the EU could move to sanctions as early as next week it there was no easing of the tensions.
Mr Lavrov, however, was adamant that Russia would respect the will of the Crimean people as expressed in Sunday's vote.
The talks, held at the residence of the US ambassador, overran by more than two hours, raising hopes that a breakthrough was on the cards.
But Mr Lavrov finally emerged to tell reporters that there was no "common vision" on a way forward, while Mr Kerry said that he had put forward a series of "constructive ideas", only to be knocked back.
Mr Kerry said that he had reiterated President Barack Obama's warning that there would be "consequences" if Russia did not find a a way to "change course".
"If the wrong choices are made, then there will be no choice but to respond appropriately because of the gravity of this breach of international standard, this breach of international law," he added.
Mr Lavrov denied Moscow had plans for a "military intrusion".

After examining the extract: 
- Briefly justify your total score, up to 100 words.
- Conclude with the score using the format: “Educational score:  <total points>”

Remember to assess from the AI Assistant perspective, utilizing web search knowledge as necessary. To evaluate the response in alignment with this additive scoring model, we’ll systematically attribute points based on the outlined criteria.