It might be the usual diplomatic ramble as a way to buy more time, but it might also be that Kerry and Lavrov yesterday negotiated something. It could be the federalisation of Ukraine, now called "constitutional reform", and the independence of Transnistria.
Federalisation and neutrality vs NATO was in Russia's proposal before the Crimea referendum and annexation of 16 March, along with the return to the agreement of 21 February. Then EU and US rejected it as impossible.
But for the negotiations of the 30 March the Russian government added Transnistria to the mix. Lavrov found the negotiations "very, very constructive", while Kerry said Russian troops must start to be withdrawn from the boarder and Ukrainian government must be center stage.
Guardian reported the conditions pre-30 March www.theguardian.com/world/2014/mar/30/russia-ukraine-john-kerry-sergei-lavrov-paris
and the results on 31 March www.theguardian.com/world/2014/mar/31/russia-ukraine-deal-troops-lavrov-kerry
""Frankly speaking, we don't see any other way for the steady development of the Ukrainian state apart from as a federation," he added. Under the Russian plan, which Barack Obama and Vladimir Putin reportedly discussed in a phone call initiated by Moscow on Friday, each region would have control of its economy, taxes, culture, language, education and "external economic and cultural connections with neighbouring countries or regions", Lavrov said."
To me it looks like Putin marched his troops up to the border and then partially withdrew them to provide the off-ramp for Obama to accept the deal and to present it as a de-escalation...
Today the joined statement of German, French and Polish foreign ministers reiterates their earlier positions, but adds that the Ukrainian government need to implement all the agreements of 21 February as a condition for association as well as the timetable for "constitutional reforms" ... this is an interesting u-turn.
The statement also "propose EU-Russia talks with Ukraine, Moldova and Georgia about the consequences of the EU-Association Agreements", which might be code for accepting military neutrality and annexation by Russia of Crimea, Transnistria, Ossetia etc.
Very interesting...