Your OSCE quote is not from 2014. The OSCE monitored many cease fire violations and massive increase in shelling by the Ukrainians in the lead up to the invasion:

Feb 14: 174 ceasefire violations, 41 explosions

Feb 15: 153 ceasefire violations, 76 explosions

Feb 16: 509 ceasefire violations, 316 explosions

Feb 17: 870 ceasefire violations, 654 explosions

Feb 18: 1,566 ceasefire violations, 1,413 explosions

Feb 19-20: 3,231 ceasefire violations, 2,026 explosions

Feb 21: 1,927 ceasefire violations, 1,481 explosions

Feb 21: Russia recognizes independence of Donetsk and Luhansk

Feb 22: 1,710 ceasefire violations, 1,420 explosions

Feb 24: Russia launches ‘special military operation’